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  • American Institute of Physics (AIP)  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Frequency dependence of the magnetic irreversibility line in high-temperature superconductors (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4515-4517 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic irreversibility line (IL) has been measured as a function of magnetic field and frequency using an ac inductance technique in single crystals of YBaCuO and BiSrCaCuO and in consolidated YBaCuO fibers. The IL is defined as the temperature of the peak in X‘ as a function of magnetic field. Above the IL magnetic flux is mobile in the superconductor and the critical current Jc is zero; below the IL flux is pinned and a Jc can exist. Very small (〈1 K) shifts in the temperature of the peak in X‘ in YBaCuO crystals are seen in fields up to 400 Oe, and for frequencies up to 20 kHz. In contrast, crystals of BiSrCaCuO show shifts downward of the X‘ peak temperature of more than 40 K at 100 Hz, and in fields of 400 Oe. Intermediate behavior is seen for YBaCuO fibers. These data and particularly the frequency dependence of the IL are discussed in terms of flux creep/flux flow in these materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344854
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  • 2
    Electronic Resource
    Electronic Resource
    dc and ac magnetic field effects in LaBaCuOx, YBa2Cu3O7−x, and other high-Tc superconductors (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5908-5910 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Small (〈300 Oe) dc magnetic fields are found to significantly lower the superconducting transition temperature Tc and change the shape of the magnetic flux exclusion M vs T curve in powder compactions of La2−xBaxCu3Oy, YBa2Cu3O7−x, and other high-Tc materials. dTc/dH of 0.02 to 0.08 deg/Oe with Hc1 less than 20 Oe near Tc are typical. The M vs T curve and the value of Hc1 are sample dependent. The results are interpreted in terms of the effect of particle size and size distribution on the material magnetic penetration depth. Measurements of the real and imaginary parts of the magnetic susceptibility show that the latter is frequency dependent over the range of 0.1–10 kHz when measured with an ac mutual inductance technique. Assuming that the material can be considered as a network of Josephson junctions, the temperature dependence of the imaginary component of the susceptibility can be used to calculate a value for the superconducting energy gap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342198
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  • 3
    Electronic Resource
    Electronic Resource
    4He cryostat with sample interlock for analysis of superconducting materials and devices (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 993-997 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have constructed 4He cryostats which accept samples up to 1.5 in. diam and can be inserted into storage Dewars having large diameter necks. These cryostats are constructed from simple and inexpensive parts, allow temperature controlled operation from 4.2 to 300 K, provide for rapid thermal cycling, and have a load/lock system to prevent exposure of the samples to air or water and to protect lab occupants from toxic materials. Design and construction details are presented and temperature control performance is discussed. Although the cryostat is designed for analysis of superconducting devices, it is useful whenever samples of several cubic inch volume need to be analyzed over a wide cryogenic temperature range with thermal stability and environmental control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141206
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  • 4
    Electronic Resource
    Electronic Resource
    Tl2Ba2CaCu2O8 films with very low microwave surface resistance up to 95 K (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2014-2016 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Very low surface resistance Tl2Ba2CaCu2O8 films of thickness 1.0 μm on (100) LaAlO3 were fabricated and characterized. The films are highly c-axis oriented (x-ray diffraction rocking curve full width half maximum of 0.68°) with good in-plane epitaxy with respect to the substrate. The Tc of the films was 107.6±0.5 K as measured by ac magnetic susceptibility. The surface resistance at 10 GHz was measured with the parallel plate resonator technique and found to be 23±5 μΩ at 4.2 K, 130±20 μΩ at 77 K, and 300±60 μΩ at 95 K. Using a 20 GHz TE011 end-wall replacement copper cavity, the surface resistance was found to be comparable to that of copper, about 18 mΩ, at 104±1 K. The surface resistance of the films is significantly lower than that of all films reported to date at temperatures above 70 K and only slightly higher than the best high-temperature superconductor films reported to date at 4.2 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107128
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