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  • American Institute of Physics (AIP)  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Silver doping and its influence on the oxygenation during in situ growth of YBa2Cu3O7−x thin films (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1349-1351 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of Ag doping on both oxygenation and deoxygenation during growth of YBa2Cu3O7−x films at 700 °C by pulsed laser deposition has been studied. Experiments show that undoped and Ag-doped films grown at 200 mTorr oxygen pressure and quenched immediately after termination of growth have a superconducting transition temperature Tc of 61 and 86 K, respectively. The high Tc of 86 K obtained with quenched Ag-doped films is thought to be due to both enhanced oxygen incorporation and reduced deoxygenation associated with Ag doping. These results show that Ag-doped YBa2Cu3O7−x films could be crucial for realizing devices based on multilayer structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357802
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructural study of yttria stabilized zirconia buffered sapphire for YBa2Cu3O7−δ thin films (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 940-946 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Yttria stabilized zirconia (YSZ) buffer layers were grown by rf-magnetron sputtering on the r (11¯02) plane of sapphire for YBa2Cu3O7−δ (YBCO) thin film deposition. Microstructural changes of YSZ buffer layers grown using different sputtering conditions (5, 10, and 20 mTorr; Ar/O2 gas mix ratio of 9:1 and 1:1) were monitored by atomic force microscopy (AFM). Films grown using a lower oxygen partial pressure (5 mTorr) and a higher Ar/O2 ratio (9:1) showed smooth surface morphology and the average surface roughness increased with an increase in oxygen partial pressure. YBCO films in situ grown by pulsed laser deposition on sapphire with a YSZ buffer layer deposited using optimized sputtering parameters (5 mTorr gas pressure, 9:1 Ar/O2 ratio) yielded the highest critical density, Jc≈4.5×106 A cm−2 at 77 K. An excellent correlation between microstructure and Jc has been found and AFM has proved to be important for the study of the microstructure of films. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360876
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  • 3
    Electronic Resource
    Electronic Resource
    Liquid crystal variable retarders in atomic scattering (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3813-3817 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The applications of liquid crystal variable retarders in the production of spin-polarized electrons and in the determination of the polarization of optical radiation from atoms excited by polarized electrons are discussed. The advantages of using liquid crystal variable retarders in the measurement of Stokes parameters are insensitivity to the incident photon direction, large transmission diameter, variable retardation over large wavelength range without mechanical movement, and in situ calibration. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147282
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  • 4
    Electronic Resource
    Electronic Resource
    Superconductivity and transport behavior of laser ablated Au-added YBa2Cu3O7−δ thin films (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1006-1008 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report here a systematic investigation of superconducting properties of Au-added YBa2Cu3O7−δ (YBCO) thin films in situ grown by pulsed laser ablation method. Films are highly c-axis oriented while the corresponding bulk samples contain multiphases. The superconducting transition temperature Tc of films remains close to 90 K even for large concentration of Au (up to 10% by weight) and the critical current denisty Jc is about 5×106 A cm−2 at 77 K (in self-field) with higher reproducibility when compared with that of undoped films of YBCO on 〈100〉 LaAlO3. Preliminary investigations indicate that Au gets rejected by the grains and dopes the grain boundaries thus improving the stability of the boundaries and hence of the films. Our result also demonstrates that pulsed laser deposition can be used to grow films of compounds that generally do not form as a single phase in bulk by the conventional solid state methods and hence offers unique possibilities in terms of exploring structure-property relationships in thin films. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116210
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