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  • 1
    Electronic Resource
    Electronic Resource
    Properties of infinite layer Ca1−xSrxCuO2 films oxygen doped by ion implantation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 1382-1384 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Infinite layer Ca1−xSrxCuO2 (CSCO) films, grown by pulsed laser deposition with x=0.66 and 0.9, were doped by implanting O+ ions with an accelerating energy of 70 keV and a dose of 3×1016 cm−2. The resistivity of the films, in the temperature range 4–200 K, decreased by over two orders of magnitude compared with the original as-grown film. Annealing the as-grown films in an atmosphere of O2 at 500 °C resulted in only a factor of 2 decrease in this temperature range. A magnetic anomaly resembling a diamagnetic transition was observed in the 85–90 K range in implanted films which was not observed in as-grown films. A comparison of the properties of implanted films, before and after annealing, suggest that increased oxygen content alone is not responsible for the observed changes, and thus defect creation resulting from implantation may also play a significant role. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360317
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  • 2
    Electronic Resource
    Electronic Resource
    Properties of Ca1−xSrxCuO2 infinite layer films grown by laser ablation deposition (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 3089-3091 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Films of the infinite layer compound Ca1−xSrxCuO2 have been grown on SrTiO3 substrates by pulsed laser ablation deposition. The properties of the films depend strongly on the processing temperature. Between 650–700 °C the films are epitaxial with the c axis oriented normal to the surface of the substrates. The surfaces of the films are smooth, as indicated by scanning electron microscopy. Films processed at temperatures above 740 or below 600 °C are polycrystalline. X-ray diffraction patterns show that the c-axis lattice constant varies from 3.23 A(ring) for x=0.10, to 3.39 for x=0.66 and 3.43 A(ring) for x=0.90. Electrical measurements show the films to have a semiconducting behavior; no diamagnetic transition was observed in these films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356159
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  • 3
    Electronic Resource
    Electronic Resource
    Technique for measuring magnetic filling factors with applications to cryogenic magnetic resonance experiments (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 1905-1911 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a new cavity perturbation technique for accurate measurement of rf magnetic filling factors, which is especially relevant to cryogenic magnetic resonance experiments. The sample volume is filled with liquid O2 which perturbs both the magnetic and electric rf fields within the electromagnetic resonator or cavity. The electric perturbation is subsequently accounted for by replacing the liquid O2 with liquid Ar which has nearly identical dielectric properties. The procedure may be refined using the dielectric properties of liquid N2 whereby the depolarizing factor associated with the sample volume may be estimated. In contrast to conventional techniques, the method usually requires little or no modification of the magnetic resonance apparatus. An ancillary result of our work has been the determination of the paramagnetic loss tangent for liquid oxygen near 80 K at 1.4 and 5.3 GHz. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146967
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  • 4
    Electronic Resource
    Electronic Resource
    High precision ac susceptometer for measuring the temperature and magnetic field dependence of the penetration depth in superconductor single crystals (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3816-3821 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An ac susceptometer has been developed for very sensitive measurement of the magnetic moment of small samples as a function of temperature and applied dc field. The system was designed specifically for measurements on small single crystals of the high Tc superconductor YBa2Cu3O7−δ in the Meissner state. The natural platelet geometry of these crystals allows results to be easily transcribed into changes in the material's magnetic field penetration depth, Δλ, an important quantity in the exploration of the underlying physics of its superconductivity. The resolution of the technique is of the order of one tenth of an angstrom for a sample of area ∼2 mm2. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1311945
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  • 5
    Electronic Resource
    Electronic Resource
    A new radiative heater for high Tc thin film growth (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 3326-3330 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design of a new radiative heater for the growth of oxide thin films is presented. A blackbody cavity approach has been used to eliminate the large temperature variations usually observed during the growth of high Tc (HTC) superconducting thin films. Results show that this simple and inexpensive design enables one to work without the need for in situ monitoring and constant adjustment of the substrate temperature. The performance of the new heater is demonstrated by the growth of excellent quality HTC thin films. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149097
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  • 6
    Electronic Resource
    Electronic Resource
    Split-ring resonators for measuring microwave surface resistance of oxide superconductors (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 1819-1823 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A cavity perturbation technique using split-ring resonators has been developed for measuring the surface resistance of metals in the frequency range 0.3–5.0 GHz. The system is designed particularly for measurements of films and crystals of high-Tc oxide superconductors. The small size of split-ring resonators in this frequency range makes them useful for measuring crystals with areas as small as 0.1 mm2. The measurement geometry is favorable for the study of films because the sample screens its substrate from the microwave fields. The resonator temperature can be kept fixed at 4.2 or 1.2 K for sample temperatures as high as 120 K and this thermal isolation from the sample allows the use of a superconducting split-ring resonator. An unloaded Q of 1.2×106 has been achieved with a superconducting resonator at 1.78 GHz and this makes it sensitive enough to detect surface resistances of the order of a few μΩ. This resonator has been used to measure the surface resistance (25 μΩ/(D'Alembertian)) of a 1-mm2 crystal of Bi2Sr2CaCu2O8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142427
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  • 7
    Electronic Resource
    Electronic Resource
    High precision calorimetric apparatus for studying electrolysis reactions (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1504-1508 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a low cost continuous flow labyrinth calorimetric system which attains 0.3% accuracy in absolute energy balance and has a minimum sensitivity of 20 mW. This system is ideally suited to measure the energy balance of electrolytic reactions for output powers ranging from 0 to at least 25 W. By employing a catalyst to recombine the gaseous reaction products, the electrolysis cell can be operated as a closed system, thus eliminating many uncertainties associated with calorimetric measurements on open cell electrolytic processes. Careful calibrations using different electrical heater configurations inside the calorimeter demonstrate insensitivity to temperature gradients and local heating. We present measurements of energy balances of electrolytic reactions using Pd and Pt cathodes in 0.1 M LiOD in D2O as electrolyte. No anomalies are observed in the energy balance of either sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141161
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  • 8
    Electronic Resource
    Electronic Resource
    Bi-Sr-Ca-Cu-oxide superconducting thin films deposited by dc magnetron sputtering (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1992-1994 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of the high-temperature superconductor Bi-Sr-Ca-Cu-oxide were deposited by dc magnetron sputtering onto various substrates. Films deposited on (100) MgO substrates achieved zero resistance between 78 and 82.5 K depending upon the annealing conditions. The best films were produced with a quick post-anneal in oxygen at 870 °C followed by a slower anneal in air at the same temperature. The composition of the sputtered films was uniform within ±3% over an area 40 mm in radius, and films deposited at 15 and 40 mm from the center of deposition both exhibited high Tc transitions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99598
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  • 9
    Electronic Resource
    Electronic Resource
    Manipulation of single vortices in YBa2Cu3O6.354 with a locally applied magnetic field (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 1010-1012 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate the controlled, reversible manipulation of individual vortices in a superconductor with a locally applied magnetic field. The local field is supplied by a field coil on a superconducting quantum interference device (SQUID). The SQUID is used to image the vortices before and after moving. This device can be used both to push individual vortices and to create individual vortex–antivortex pairs. We calculate the force applied on a rigid vortex and find that ∼0.5 pN is necessary to move vortices in underdoped single crystals of YBa2Cu3O6.354 with Tc∼ 12 K. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1445468
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  • 10
    Electronic Resource
    Electronic Resource
    Stability of magnesium implanted YBa2Cu3O7 thin films (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 3709-3711 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnesium ions were implanted into highly crystalline YBa2Cu3O7 (YBCO) thin films for the purpose of patterning. Films were implanted at doses corresponding to Mg contents of x=0.008, 0.02, and 0.04 in the formula YBa2(Cu1−xMgx)3O7. High temperature annealing (900 °C) of films implanted below the solubility limit was successful in obtaining single phase, Mg doped YBCO films with finite resistivities at 77 K and x-ray (005) rocking curve widths 〈0.15°. An electron probe microanalysis on a film patterned using Mg implantation revealed that lateral diffusion of Mg ions resulting from annealing was limited to only a few microns. The superior quality of a top layer film indicated that Mg ion implantation is suitable for multilayer patterning. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120489
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