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  • 1
    Digitale Medien
    Digitale Medien
    Orientation of YBa2Cu3O7−x films on unbuffered and CeO2-buffered yttria-stabilized zirconia substrates (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4753-4760 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: YBa2Cu3O7−x (YBCO) films deposited by pulsed laser ablation on unbuffered and CeO2-buffered yttria-stabilized zirconia (YSZ) substrates were studied by x-ray diffraction and transmission electron microscopy to investigate film orientation. From φ scans it was determined that the unbuffered films possess two major in-plane orientation relationships with the substrate. Both have (001)YBCO(parallel)(001)YSZ, with either [100]YBCO(parallel)[100]YSZ or [110]YBCO(parallel)[100]YSZ, a 0° or 45° orientation, respectively. As deposition temperature increases, satellite peaks that straddle the 0° or 45° orientations develop. The Σ boundary and near coincident site lattice descriptions are applied to the discussion of these misorientations. In general the CeO2-buffered YBCO films align with to the 45° orientation to the CeO2 buffer layer. Out-of-plane film orientation was investigated for both unbuffered and CeO2-buffered YBCO films and expressed as a ratio of the amount of c⊥ material to a⊥ material. Buffered films exhibited c⊥ material to a⊥ material ratios approximately twice those of unbuffered films. Transmission electron microscopy combined with the x-ray data was used to develop an explanation for the trends in the variation of the c⊥/a⊥ ratio with film deposition temperature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.357245
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  • 2
    Digitale Medien
    Digitale Medien
    Superconductor GdBa2Cu3O7−δ edge junctions with lattice-matched Y0.6Pr0.4Ba2Cu3O7−δ barriers (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2871-2873 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: High-temperature-superconductor Josephson junctions with an edge geometry of superconductor/normal-metal/superconductor have been fabricated on yttria-stabilized zirconia substrates by engineering the electrode and N-layer material to reduce the lattice mismatches (a, b, and c). With GdBa2Cu3O7−δ as electrodes and Pr-doped Y0.6Pr0.4Ba2Cu3O7−δ as a barrier, the lattice mismatches from electrode and barrier layer are reduced to a very low level. The junctions fabricated with such a design demonstrate resistively shunted junction current-voltage characteristics under dc bias at temperatures in the range of 77–88 K. The quite low specific interface resistivity on the order of 10−10 Ω cm2 indicates that the junction performance is controlled by the normal-metal (N) layer material instead of the interfaces. The use of lattice-matched electrode and N-layer material is one of the key design rules to obtain controllable high-temperature superconductor Josephson junctions. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.360094
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  • 3
    Digitale Medien
    Digitale Medien
    Setup for in situ x-ray diffraction and ion-channeling studies of ion-implantation effects in thin films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 3656-3660 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A novel setup is introduced that combines energy-dispersive x-ray diffraction and ion-channeling capabilities for damage studies on single-crystalline thin films irradiated with 100–720 keV heavy ions. Channeling measurements using 2 MeV He ions provide depth-resolved information on the damage buildup. The x-ray diffraction tool is used to measure damage-related lattice strain, and can provide information on bombardment-induced disorder complementary to the channeling technique. Data obtained during the implantation of 360 keV Ar2+ ions into a zirconia thin film illustrate the potential of the instrument. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1149973
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  • 4
    Digitale Medien
    Digitale Medien
    Correlation of surface topography and flux pinning in superconducting YBaCuO films (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 5099-5102 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The surface topography of YBa2Cu3O7 thin films prepared by pulsed laser deposition is studied by atomic force microscopy and scanning tunneling microscopy. The possible contributions from observed structural features to the critical current density Jc are discussed. It is shown that the contribution of the screw dislocations associated with some structures can be either repulsive or attractive, depending on the dominant pinning mechanism. At low magnetic fields (to about 0.25 kOe) these dislocations can account for the observed critical current density values (Jc(approximately-greater-than)1011 A/m2) while for larger fields the higher-density steplike growth structures can account for significant values of Jc. It is shown that the pinning strength associated with pinning at steps varies inversely with thickness.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350612
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  • 5
    Digitale Medien
    Digitale Medien
    Properties of YBa2Cu3O7−δ thick films on flexible buffered metallic substrates (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2397-2399 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report superconducting and mechanical properties of YBa2Cu3O7−δ (YBCO) thick films on Ni-based alloys with a textured yttria-stabilized zirconia (YSZ) buffer layer. The YBCO and YSZ layers were deposited by pulsed laser deposition and ion beam assisted deposition, respectively. It was found that the transport critical current density (Jc) correlates very well with the YBCO mosaic spread. Jc over 1×10 6 A/cm2 at 75 K and ∼1×107 A/cm2 at 4 K were obtained in the 1-μm thick YBCO films. Zero field critical current of 120 amps at 75 K was obtained in a 2-μm-thick and 1-cm-wide YBCO film. Angular dependence measurement revealed Jc peaks for both H(parallel)c and H(parallel)a-b. The peak for H(parallel)c implies additional pinning due to defects such as small angle grain boundaries or twin boundaries. Bending tests at 75 K showed that the YBCO thick films on the metallic substrates could sustain a strain of 0.4% and over 1% for tension and compression, respectively. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.114559
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  • 6
    Digitale Medien
    Digitale Medien
    Properties of YBa2Cu3O7−δ films upon low fluence laser irradiation (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 7161-7163 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The electrical responses and crystallinity of YBa2Cu3O7−δ films were measured as a function of excimer laser exposure (308 nm) and laser fluences ranging from 20 to 150 mJ/cm2. Tc and Jc were measured with an inductive technique and with standard dc transport measurements. The crystallinity of the films, as determined by Rutherford backscattering spectrometry, scanning electron microscopy, and x-ray diffraction, was altered by the formation of a degraded surface layer, even at fluences well below the melting threshold. The critical current of a film can be modified with a high degree of accuracy and can be correlated with a boundary layer in the film. This allows for the critical current to be decreased over three orders of magnitude with a resolution of 255 A/cm2 per laser shot.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349778
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  • 7
    Digitale Medien
    Digitale Medien
    Relationship between film thickness and the critical current of YBa2Cu3O7−δ-coated conductors (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3692-3694 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: During the development of YBa2Cu3O7−δ (YBCO) coatings on flexible metal tapes, it has become evident that the achievable critical current (Ic) reaches a maximum value of about 200 A per cm of conductor width at a coating thickness of 1–2 μm. Additional YBCO beyond this thickness can actually reduce Ic. To investigate, critical current density (Jc) has been measured for samples with YBCO ranging from 0.39 to 6.3 μm in thickness. Several films were thinned by ion milling and remeasured with two significant results: almost no supercurrent is carried at thickness levels above 2 μm; and for films thicker than 3 μm, Jc is drastically reduced near the substrate as well. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.125431
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  • 8
    Digitale Medien
    Digitale Medien
    Heteroepitaxial growth of highly conductive metal oxide RuO2 thin films by pulsed laser deposition (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 1677-1679 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Highly conductive ruthenium oxide (RuO2) has been epitaxially grown on LaAlO3 substrates by pulsed laser deposition. The RuO2 film is (h00) oriented normal to the substrate surface. The heteroepitaxial growth of RuO2 on LaAlO3 is demonstrated by the strong in-plane orientation of thin films with respect to the major axes of the substrate. High crystallinity of RuO2 thin films is also determined from Rutherford backscattering channeling measurements. Electrical measurements on the RuO2 thin films demonstrate a quite low room-temperature resistivity of 35±2 μΩ cm at deposition temperatures of above 500 °C. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.115054
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  • 9
    Digitale Medien
    Digitale Medien
    A versatile substrate heater for use in highly oxidizing atmospheres (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 437-440 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We report the design, construction and performance of a versatile substrate heater that meets the severe design constraints of heating substrates to high temperatures (≤900 °C) in relatively high pressures (hundreds of Torr) of oxidizing gases. The heater has been used to heat substrates by both thermal conduction via a conductive high temperature cement and by direct radiation. In particular, the production of high-quality YBa2Cu3O7−δ thin films grown on radiatively heated LaAlO3 substrates is demonstrated using the pulsed laser deposition (PLD) technique.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1142139
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  • 10
    Digitale Medien
    Digitale Medien
    Large critical current densities in YBa2Cu3O7−x thin films made at high deposition rates (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 523-525 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Critical current densities (Jc) in YBa2Cu3O7−x films made at deposition rates from 0.1 to 14.5 nm/s (∼50 μm/h) were measured using a direct transport method. As the deposition rate was increased by two orders of magnitude, the films exhibited no marked degradation in current carrying capability with Jc of ∼4×106 A/cm2 at 77 K and zero field. Jc for all the films showed similar behavior under a magnetic field up to 8 T, although extra structural defects were found in the films deposited at the higher rates. The results from this experiment indicate the feasibility for coating wires, tapes, and other macroscopic shapes with high Tc superconductors using proper vapor deposition techniques.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.104245
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