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  • Articles  (27)
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  • thin films  (27)
  • Springer  (27)
  • Electrical Engineering, Measurement and Control Technology  (27)
  • 1
    Electronic Resource
    Electronic Resource
    Preparation of Bi1−xSbx films by electrodeposition (2000)
    Springer
    Journal of applied electrochemistry 30 (2000), S. 385-392 
    Details
    ISSN: 1572-8838
    Keywords: antimony bismuth alloys ; electrodeposition ; semiconductors ; thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A method has been developed to produce composition modulated Bi1−x Sb x alloys by electrodeposition. The electrolyte which consists of NaCl 4 M and HCl 1 M (pH 0) in aqueous medium, allows codeposition of bismuth and antimony to be accomplished at room temperature on glassy carbon. The composition of the films, their crystal structure, morphology and resistivity were studied as a function of electrochemical parameters and bath composition. It is shown that the electrodeposits are monophasic and exhibit a polycrystalline state. The obtained alloys represent a continuous series of solid solution. The film composition is dependent on the applied current density. The electrical resistivity is of the order of 3–7 μΩm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003990327662
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  • 2
    Electronic Resource
    Electronic Resource
    Unusual Photon Energy Dependence of the Cooper Pair Breaking Rate in YBa2Cu3O7−δ Epitaxial Thin Films (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 675-680 
    Details
    ISSN: 1572-9605
    Keywords: YBCO ; Cooper pair ; thin films ; ultrafast phenomena
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The transient photoimpedance response of epitaxial YBa2Cu3O7−δ thin films has been studied using 100 fs Ti:Sapphire laser pulse excitation. Both temperature and photon energy dependence of the fast optical response signal (whose temperature dependence can be explained by a kinetic inductance model involving Cooper pair breaking) were studied. The pair breaking rate is strongly photon energy-dependent, with a resonance around 1.5 eV with a width of only 100 meV, which is very surprising given the strong electron correlation in this metallic system and may be explained in terms of the stripe phase model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007708304186
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  • 3
    Electronic Resource
    Electronic Resource
    Growth of Tl-2201 Superconducting Thin Films on Single Crystal LaAlO3 (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 73-74 
    Details
    ISSN: 1572-9605
    Keywords: Thallium cuprates ; Tl-2201 ; thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The growth of Tl-2201 films on LaAlO3 single crystal substrates has been investigated. The synthesis involved precursor films made by laser ablation that were treated with Tl2O(g) in near-equilibrium conditions. By optimising the method of preparation, we obtained films that were highly smooth, c-axis oriented and epitaxial. The rocking curve of the (0010) reflection had a FWHM of 0.27°. A Tc of 92K was achieved without post-annealing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022638030511
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  • 4
    Electronic Resource
    Electronic Resource
    Photoinduced enhancement of superconductivity (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 127-130 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; thin films ; photoconduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The photoinduced enhancement of superconductivity in RBa2Cu3O x (R=rare earth or yttrium) and Pr y R1−y Ba2Cu3O x was explored through temperature-dependent resistivity, Hall coefficient and mobility, and x-ray diffraction measurements. The increases inT c are enhanced near the metal-insulator transition, although photoinduced changes always exist in oxygendeficient samples. Several explanations, including intergrain Josephson coupling, photoassisted oxygen ordering, and the trapping of photogenerated electrons in oxygen vacancies, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730382
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  • 5
    Electronic Resource
    Electronic Resource
    Thin-film processing of high-T c superconductors (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 1-17 
    Details
    ISSN: 1572-9605
    Keywords: Superconductors ; thin films ; thin-film processing ; thin-film deposition ; sputtering ; coevaporation ; activated reactive evaporation ; molecular beam epitaxy ; laser ablation ; CVD ; MO-CVD ; PA-CVD ; multilayers ; heterostructures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract This review of high-T c superconducting thin-film processing focuses on the developments in thin-film deposition technologies since 1987. The common deposition processes are described with reference to their effects on superconductor film performance. A comparative evaluation of the potential of the technologies is also given. The development of multilayers and heterostructures is an important requirement for future device applications and is also described. The latest results of the deposition of novel superconducting materials and deposition on uncommon substrates are discussed. The outlook on some imminent topics of future development in process technologies for high-T c superconducting thin films is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618500
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrasonic Micromotors Based on PZT Thin Films (1999)
    Springer
    Journal of electroceramics 3 (1999), S. 143-150 
    Details
    ISSN: 1573-8663
    Keywords: ultrasonic actuator ; thin films ; PZT ; integration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The integration of piezoelectric Pb(Zr,Ti)O3 thin films on silicon substrates for ultrasonic motor applications is reviewed. With suitable buffer and bottom electrode layers the problems due to high processing temperatures in oxygen ambient can be handled. Reproducibility can be increased by stabilized electrode systems and seeding layers for PZT nucleation. Elastic fin micromotors of millimeter size have been fabricated. They achieve the necessary torques, low speeds, and battery voltage operation for applications in wristwatches. However, their efficiency needs to be improved. Better figure of merits of the material still can be achieved. Better designs with larger coupling factors are desirable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009943110147
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  • 7
    Electronic Resource
    Electronic Resource
    Oxide Thin Films for Tunable Microwave Devices (2000)
    Springer
    Journal of electroceramics 4 (2000), S. 393-405 
    Details
    ISSN: 1573-8663
    Keywords: ferroelectrics ; ferrite ; thin films ; tunable microwave devices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Oxide thin films have been studied for frequency and phase agile electronics. The electric-field tuning of microwave devices employs ferroelectrics, while the Magnetic-field tuning uses ferrites. The critical material parameters for ferroelectric thin films are the tunability of the dielectric constant and the dielectric loss. This paper describes the current understanding of the fundamental mechanisms of these properties and the research efforts to improve them in ferroelectric thin films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009903802688
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  • 8
    Electronic Resource
    Electronic Resource
    Optical Waveguiding Properties of (Pb,La)TiO3/Al2O3 Planar Structures (1998)
    Springer
    Journal of electroceramics 2 (1998), S. 105-111 
    Details
    ISSN: 1573-8663
    Keywords: lanthanum doped lead titanate ; thin films ; planar waveguide ; optical characterizations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Thin films of lead lanthanum titanate (Pb,La)TiO3 have been grown by radio-frequency magnetron sputtering on (0001) Al2O3 substrates. The structure, the microstructure and the optical properties of the films have been investigated as a function of the postdeposition annealing. Films deposited at low temperatures crystallize to a perovskite phase after the annealing treatment from 500°C to 650°C. X-ray (θ−2θ) diffraction studies have shown that films are crystallized with a strong (111) orientation and the best crystalline structure is reported at 600°C. The optical properties were both demonstrated by spectrophotometry and prism coupling. PLT thin films with a transparency of 80% in the wavelength range 300–2000 nm have exhibited a refractive index of 2.38 @ 632.8 nm representing 97% of the bulk corresponding material. Investigation of optical propagation has been accomplished in a 10 mm long planar optical waveguide using a butt-coupling configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009931107964
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  • 9
    Electronic Resource
    Electronic Resource
    Ferroelectricity in PbTiO3 Thin Films: A First Principles Approach (2000)
    Springer
    Journal of electroceramics 4 (2000), S. 379-383 
    Details
    ISSN: 1573-8663
    Keywords: ferroelectricity ; thin films ; perovskites ; lattice instabilities ; first principles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The ground-state ferroelectric distortion of PbTiO3 thin films is studied using a first-principles effective Hamiltonian to describe the structural energetics at a microscopic level. Under short-circuit electrical and zero-stress mechanical boundary conditions, (0 0 1) films as thin as one unit cell are found to support a stable perpendicular polarization. Size effects in the layer-by-layer ferroelectric distortion are discussed. The continuum limit of the first-principles effective Hamiltonian has the same form as the widely-used Landau-Ginzburg expression for the free energy near Tc, so that the present results can be directly related to those of previous phenomenological studies. In particular, a microscopic interpretation of the extrapolation length δ is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009991332731
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  • 10
    Electronic Resource
    Electronic Resource
    Pulsed Laser Deposition of Zr1-xCexO2 and Ce1-xLaxO2-x/2 for Buffer Layers and Insulating Barrier in Oxide Heterostructures (2000)
    Springer
    Journal of electroceramics 4 (2000), S. 369-377 
    Details
    ISSN: 1573-8663
    Keywords: high temperature super conductors ; magnites ; oxide epitaxy ; thin films ; pulsed laser
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We have studied the pulsed laser deposition (PLD) of Zr1-xCexO2 and Ce1-xLaxO2-x/2 initially to grow buffer layers for perovskite films deposited on Si, LaAlO3, SrTiO3 and MgO and then to produce tunneling barriers for cuprate or manganite heterostructures. On (1 0 0) Si, the deposition of Zr1-xCexO2 (x = 0.12) produces a smooth epitaxial layer (R RMS = 0.25/1μm2), which allows the further deposition of high quality YBa2Cu3O7 (Tc ≥ 88 K) and La0.7Sr0.3MnO3 films. On the other hand, the use of Ce1-xLaxO2-x/2 (0≤ x ≤ 0.4) makes it possible to match the YBa2Cu3O7 and La0.7Sr0.3MnO3 layers to various substrates. The buffer layers are epitaxially grown with a 45° rotation of the in-plane axes with respect to those of the substrate, and the smoothness is high (R RMS = 0.25/1μm2). In the case of an ultra-thin barrier (≅2.5 nm) of Ce1-xLaxO2-x/2 sandwiched in a La0.7Sr0.3MnO3, the out-of-plane mismatch of 2 induces distortions at the interface steps, which propagate into the topmost La0.7Sr0.3MnO3 layer. This is in contrast to the case of SrTiO3 barriers where an ideal crystal continuity in the growth direction is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009935214984
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  • 11
    Electronic Resource
    Electronic Resource
    Ion Implantation of Optical Ferroelectrics (1999)
    Springer
    Journal of electroceramics 3 (1999), S. 179-193 
    Details
    ISSN: 1573-8663
    Keywords: ion implantation ; optical ferroelectrics ; thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We discuss ion implantation as a powerful non-equilibrium processing technology and show its potential for optical waveguide formation by damage engineering and by direct doping. Also the strong improvement of photorefractive properties by implantation-induced vacancies is demonstrated. Finally recent results of the growth of thin ferroelectric films by laser epitaxy and metal-organic vapor-phase epitaxy are presented. The combination of thin film growth techniques of optical ferroelectrics together with ion beam modification will prove important in this strongly advancing field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009951311965
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  • 12
    Electronic Resource
    Electronic Resource
    High Transition Temperature Superconducting Quantum Interference Devices: Basic Concepts, Fabrication and Applications (1999)
    Springer
    Journal of electroceramics 3 (1999), S. 195-212 
    Details
    ISSN: 1573-8663
    Keywords: superconducting quantum interference devices ; high transition temperature superconductors ; thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The performance of superconducting quantum interference devices (SQUIDs) and SQUID based magnetometers made from thin films of high transition temperature superconductors (HTS) has greatly improved since the discovery of HTS more than a decade ago. This fact is related to a steady improvement in the fabrication technology for HTS thin films and Josephson junctions. The state-of-the-art in HTS SQUID fabrication, device concepts and applications is briefly reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009903428803
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  • 13
    Electronic Resource
    Electronic Resource
    Effect of Ultra-Thin SrTiO3 Seed Layer on the Microwave Surface Resistance of YBa2Cu3O7 Films Deposited on (1 0 0) MgO (2000)
    Springer
    Journal of electroceramics 4 (2000), S. 319-325 
    Details
    ISSN: 1573-8663
    Keywords: high temperature super conductors ; microwave properties ; thin films ; pulsed laser deposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract RHEED controlled ultra-thin buffer layers of SrTiO3 have been deposited on (1 0 0) MgO by pulsed laser deposition to grow YBa2Cu3O7 films for microwave applications. A buffer layer with a thickness from 5 to 40 unit cells of SrTiO3 is sufficient to expand to more than 60°C the range of deposition temperatures for which a low microwave surface resistance [Rs(10 GHz, 77 K)〈0.5 mΩ] is obtained. The Rs values are as low as those obtained on LaAlO3 substrates, furthermore they present a slightly lower magnetic field dependency. The XRD Φ-scans show that the SrTiO3 seed layer induces an oriented epitaxial growth with the [1 0 0] axis of YBCO parallel to the one of MgO over this broadened range of deposition temperatures. This seed layer promoting effect is not observed with other oxides such as Ba0.15Sr0.85TiO3, CeO2, Ce1−x La x O2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009958424553
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  • 14
    Electronic Resource
    Electronic Resource
    How the Surface Resistance R s of Patterned High-T c Superconducting Thin Film Is Affected by the Film's Edge (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 291-296 
    Details
    ISSN: 1572-9605
    Keywords: Surface impedance of high-T c superconductor ; thin films ; penetration depth ; critical current
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract This paper defines an effective microwave surface resistance $$R_{\text{s}}^{{\text{eff}}}$$ for the nonuniform distribution of microwave surface resistance R s in the strip of a microstrip. It is proved that $$R_{\text{s}}^{{\text{eff}}}$$ is equivalent to the expression of R s used in experiments, and that the $$R_{\text{s}}^{{\text{eff}}}$$ is dominated by the edge part, i.e., the area of width λ2/2t from the strip edge, where λ is the magnetic penetration depth and t is the film thickness. Under the assumption that $$R_s \sim \left( {H_{{\text{rf}}}^y } \right)^n$$ where $$H_{{\text{rf}}}^y$$ is the component of rf magnetic field along the film thickness and n is an integer, the ratio of the contributions of the edge part and the rest of the strip to $$R_s^{{\text{eff}}}$$ is calculated by using an approximate analytical expression of the surface current density distribution J s in the strip and $$H_{{\text{rf}}}^y$$ calculated by the London equation. The effect of film's edge on R s was studied using a microstrip resonator. It is found that the perfectness of the edge could affect the magnitude of the power dependence of R s significantly, which agreed with our analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022696220632
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  • 15
    Electronic Resource
    Electronic Resource
    Correlation Between the Superfluid Density ns(T) ∝ 1/λ2ab(T) at Low Temperatures and Nanostructures in the a–b Planes of YBCO (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 753-757 
    Details
    ISSN: 1572-9605
    Keywords: high-temperature superconductivity ; YBCO ; thin films ; superfluid density ; critical current ; nanostructures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract A correlation between the superfluid density n s(T) ∝ 1/λ2 ab(T) at low temperatures and the nanoscopic disorder in the a–b planes of YBCO thin films has been revealed. It has been found that a degree of this disorder can be determined from the two-component dependence of the critical current density on temperature. These findings are consistent with a discovery of a nanodomain structure in the a–b planes of an optimally doped YBCO [J. Etheridge, Phil. Mag. A73, 643 (1996)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007818300517
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  • 16
    Electronic Resource
    Electronic Resource
    Novel Metal-Organic Chemical Vapor Deposition / T1F Annealing Route to Thin Films of Tl1Ba2Ca2Cu3O9+x (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 133-134 
    Details
    ISSN: 1572-9605
    Keywords: TI-1223 ; thin films ; MOCVD ; fluoride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Thin films of TI1Ba2Ca2Cu3O9+x have been grown on single crystal (110) LaAlO3 by a metal-organic chemical vapor deposition process employing Ba(hfa)2.mep, Ca(hfa)2.tet. and Cu(dpm)2 (hfa = hexafluoroacetylacetonate; dpm = dipivaloylmethanate; tet = tetraglyme; mep =methylethylpentaglyme) as the volatile metal sources. A subsequent phase-selective annealing procedure accomplishes thallination using TIF in a bulk oxide pellet. The resulting films are nearly phase-pure and highly oriented and contain negligible fluoride by windowless energy-dispersive x-ray measurements. The films exhibit transport measured Tc = 103 K and Jc 〉 104 A/cm2 (77 K. 0 T) and at low temperatures retain Jc 〉 105 A/cm2 (5 K, 4.5 T) as measured by magnetic hysteresis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022635424576
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  • 17
    Electronic Resource
    Electronic Resource
    Effect ofin Situ cooling on superconductivity of artificially layered BSCCO films with 2223 structure (1990)
    Springer
    Journal of superconductivity 3 (1990), S. 411-416 
    Details
    ISSN: 1572-9605
    Keywords: Bi2Sr2Ca2Cu3O x ; thin films ; sequential deposition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Thin BSCCO films with the 2223 structure were deposited onto MgO substrate kept at 665°C by applying a sequential sputtering method using metallic Bi and Sr-Ca-Cu-O targets. The resultant films were then cooled under various oxygen partial pressures and cooling rates. It was found that the oxygen partial pressure and substrate temperature during cooling affect significantly the development of superconductivity of the as-deposited films. When the films were cooled stepwise under a critical oxygen partial pressure around 0.3 torr, the as-deposited films showed either superconductivity or nonsuperconductivity behavior. HRTEM images of the films showed no essential difference in the modulated structure, suggesting that the excess oxygen in the Bi-O double layers is the same and not the cause of the different superconducting behavior in the as-deposited films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617467
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  • 18
    Electronic Resource
    Electronic Resource
    Flux creep effects in the transport properties ofC-axis oriented BSCCO thin films (1992)
    Springer
    Journal of superconductivity 5 (1992), S. 107-114 
    Details
    ISSN: 1572-9605
    Keywords: High Tc ; thin films ; flux creep
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Critical current density vs. temperature curves and I–V characteristics have been measured onc-axis-oriented BSCCO thin films. The experimental data have been described in terms of flux creep effects. Although the films are not single phase and carry a slightly lower critical current density with respect to those of BSCCO single crystals, the measurements point to the presence of flux thermally activated phenomena with a pinning potentialU 0 of about 25 meV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618053
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  • 19
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    Measurement of the surface resistance of YBa2Cu3O7−x thin films using stripline resonators (1990)
    Springer
    Journal of superconductivity 3 (1990), S. 251-259 
    Details
    ISSN: 1572-9605
    Keywords: Resonators ; r.f. measurements ; stripline ; surface resistance ; thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We review methods of measuring surface resistance (R s ) of thin films using stripline resonators, and present our measurements of theR s of YBa2Cu3O7−x films as a function of frequency, temperature, and r.f. magnetic field. The films were deposited on LaAlO3 substrates by two methods: (1) electron-beam coevaporation of Y, BaF, and Cu followed by annealing in O2, and (2) single-targetin situ sputtering. The measurements were obtained at frequencies from 0.4 to 10 GHz, temperatures from 4 to 90 K, and an r.f. magnetic field range from 0 to 30 Oe. At low temperature and low r.f. field at 0.4 GHz, theR s values obtained for the two deposition methods are approximately 7×10−6 and 4×10−6 Ω, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00625265
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  • 20
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    High-temperature superconducting microwave devices: Fundamental issues in materials, physics, and engineering (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 119-160 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductivity ; microwave devices ; thin films ; surface resistance ; microwave device fabrication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract High-T c superconductivity has generated a great deal of interest because of the challenges it presents in the fields of material science, condensed matter physics, and electrical engineering, and because of the potential applications which may result from these research efforts. Thin-film passive microwave components may become the first high-temperature superconducting (HTS) devices available for widespread use and commercialization. In this article, we review aspects of material science, physics, and engineering which directly impact high-T c superconducting microwave devices and discuss issues which determine the performance of these devices. Methods of growing HTS thin films on large-area substrates, techniques for fabricating single-level HTS passive microwave components, and the relevant properties of high-T c superconducting films are discussed, with a focus on thin films of the HTS material YBa2Cu3O7−δ. Several known mechanisms for microwave loss in both the superconductor and the dielectric substrate are presented. An overview of the general classes of superconducting passive microwave devices is given, and representative microwave devices which have been recently demonstrated are described in detail. Examples of a select few HTS active microwave components are also presented. Potential microwave applications are illustrated with comparisons to current technology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00625741
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  • 21
    Electronic Resource
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    High-quality YBa2Cu3O7 films on 4-in. Wafers of sapphire, gallium arsenide, and silicon (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 231-233 
    Details
    ISSN: 1572-9605
    Keywords: YBa2Cu3O7 ; thin films ; large-area deposition ; semiconductor substrates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Our technique of reactive thermal co-evaporation has been extended to fabricate large films (up to 4 in.) of YBa2Cu3O7 with high quality. A rotating substrate holder is used to separate the deposition and oxidation processes. This allows free access of the metal vapors. As large substrate wafers we use Al2O3, Si, and GaAs with buffer layers of CeO2, YSZ, and MgO, respectively. On all substrates, the uniformity of thickness and composition was better than 2%. Inductively measuredT c andj c (77 K) were 87.5±0.2 K and 〉1×106 A/cm2, respectively, across the full wafer area. This holds also for GaAs substrates due to a new procedure of capping by Si3N4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730401
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  • 22
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    Temperature and spectral dependences of persistent photoconductivity in YBa2Cu3O x thin films (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 743-746 
    Details
    ISSN: 1572-9605
    Keywords: Photoconductivity ; high-T c superconductors ; thin films ; spectral dependence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Temperature and spectral dependences of photoinduced changes of resistance were measured in YBa2Cu3O x thin films with oxygen content ranging as 6.35 〈x 〈 6.75. The absolute value of efficiency of initiation of photoinduced changes decreases with increase in oxygen content, but the position of peaks in the spectral dependence does not change with a change ofx. Temperature dependences of efficiency have an anomaly atT∽220 K, which is present in all the samples studied, and correlates with anomalies observed by other experimental techniques. Qualitatively similar temperature and spectral dependences of efficiency for the samples in both the insulating and metallic phases may be considered as an indication that the persistent photoconductivity effect in YBCO on both sides of the metal-insulator transition has a common origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00721656
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  • 23
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    Photodoping Effects in High Critical Temperature Superconducting Films and Josephson Junctions (2000)
    Springer
    Journal of superconductivity 13 (2000), S. 1-20 
    Details
    ISSN: 1572-9605
    Keywords: doping ; Josephson junctions ; photoconductivity ; superconductivity ; thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Persistent photoconductivity is an interesting and unusual property of high temperature superconductors. Illumination of these compounds can lead to a change in doping that is persistent at low temperature and relaxes back to its initial value at elevated temperatures. This photodoping can give rise to an improvement of superconducting properties, which is contrary to the illumination effects in conventional superconductors. Furthermore, these photo-induced effects can also be used to probe and modify the properties of grain boundaries in grain boundary Josephson junctions. This paper reviews the experimental data and proposed theoretical models related to these photoinduced effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007761805713
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  • 24
    Electronic Resource
    Electronic Resource
    Full Wafer In Situ Deposition of Thallium Lead Superconductors (1998)
    Springer
    Journal of superconductivity 11 (1998), S. 129-132 
    Details
    ISSN: 1572-9605
    Keywords: Superconductivity ; TIPbSrCaCuO ; thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Thin films of (Tl,Pb)Sr2Ca0.8Y0.2Cu2O7, and (Tl,Pb)Sr2CuO5 can be grown in a single step process which involves sputter deposition from a mixed oxide target and simultaneous thermal evaporation of Tl2O. The use of a radiant heater has allowed extension of this in situ deposition process to full LaAlO3 and NdGaO3 wafers. Variations in the composition of the deposited film is 〈 4% across a 50 mm wafer while the thickness uniformity is ≍ 8%. The highest transition temperature for a (Tl,Pb)Sr2Ca0.8Y0.2 Cu2O7 film thus far is 83 K. The RMS surface roughness of (Tl,Pb)Sr2CuO5 films is uniform across the wafer and approximately 1% of the film thickness for films 20 to 100 nm thick.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022683307738
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  • 25
    Electronic Resource
    Electronic Resource
    Pinning potential transport measurements of Bi2Sr2CaCu2O x thin films (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 849-851 
    Details
    ISSN: 1572-9605
    Keywords: High-temperature superconductors ; thin films ; critical current ; flux creep
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Flux creep characteristics ofc-axis-oriented Bi2Sr2CaCu2O x thin films grown by the method of electron beam evaporation of stoichiometric target and subsequent annealing have been investigated in the absence of external magnetic field. A decrease of the pinning potential with decreasing temperature is obtained fromI–V curves. This result is explained by the presence of the spatially nonlinear pinning potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320881
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  • 26
    Electronic Resource
    Electronic Resource
    Preparation and properties of Tl2Ba2CaCu2O8 thin films (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 767-771 
    Details
    ISSN: 1572-9605
    Keywords: Tl cuprates ; thin films ; ex-situ thin film processing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Anex situ process has been developed to produce thin superconducting Tl2Ba2CaCu2O8 films. The properties of films grown on different substrates using different annealing regimes were studied. Critical temperatures of 103–107 K were measured on films prepared in a broad range of annealing temperatures on SrTiO3, LaAlO3, and Y-ZrO2 substrates. A critical current density,J c, of 2×106 A/cm2 at 77 K was measured on LaAlO3. Film morphology was studied by SEM, AFM, and STM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00721661
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  • 27
    Electronic Resource
    Electronic Resource
    Infrared conductivity in the normal state of cuprate thin films (1996)
    Springer
    Journal of superconductivity 9 (1996), S. 3-6 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductors ; reflectivity ; infrared ; thin films
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract This paper summarizes the main features of the infrared conductivity spectra in the 500–7000 cm−1 range derived from room-temperature reflectivity measurements performed on a variety of thin films (YBa2Cu3O7, BiSrCaCuO). The conductivity of these samples decreases with frequency as a power law with an exponent ∼0.7, and the scattering rate increases linearly with frequency. A detailed comparison with the conductivity for the marginal Fermi liquid (Abrahams, Littlewood, and Varma) and for the Luttinger liquid (Anderson) is performed. In the former case, the effect of temperature appears crucial even in this energy range (ω≥T) and allows one to achieve satisfactory fits. In the latter case, both the conductivity and the scattering rate may be accounted for by a single parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00728415
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