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  • 1
    Electronic Resource
    Electronic Resource
    Scanning Hall microprobe measurements of magnetization profiles in YBa2Cu3O7−y single crystals (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3890-3902 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A scanning Hall microprobe technique has been developed to measure the magnetic field around superconductors, and to make precision measurements of the "critical state'' profiles in single crystals of YBa2Cu3O7−y. The field around a superconducting crystal has been calculated for the Meissner state and for the remanent state. This enables a quantitative analysis of the critical state profiles, and a novel method to determine JC. The invasion of magnetic flux above HC1 was examined and this provides direct evidence for the existence of a surface barrier to the entry of magnetic flux lines. The temperature dependence of JC was also measured and compared with that of the low TC material Nb0.5Ti0.5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352876
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Novel field-induced asymmetry in the remanent magnetization of the superconductor YBa 2 Cu 3 O 7 (1992)
    [s.l.] : Nature Publishing Group
    Nature 358 (1992), S. 567-569 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A Hall microprobe, consisting of a 1,500-A bismuth film with an active area 2x4 ^m2 and sensitive to changes in field of ±0.3 Oe (D.A.B. and N.P.O., manuscript in preparation), is scanned at a constant height 15 (im above the a-b face of a YBa2Cu3O7 (YBCO) crystal (Fig. 1, inset). Typically, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/358567a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Recent advances in raisingT c and establishing the gap-symmetry of high-T c cuprate superconductors (1995)
    Springer
    Journal of low temperature physics 99 (1995), S. 251-262 
    Details
    ISSN: 1573-7357
    Keywords: 74.72.−h ; 74.62.−c ; 74.90.+n
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The most recent attempts in raising Tc of cuprate superconductors were successful by synthesizing new Hg-based cuprate materials. We discuss some properties of materials from this series with varying numbers of Cu-O planes per unit cell, including the considerable rise of the critical temperature under the influence of external pressure. In the second part of this contribution, various attempts to directly determine the symmetry of the superconducting order parameter of high-Tc cuprates are mentioned and set into perspective. The experimental approaches are all based on probing the phase of the order parameter in suitably connected closed superconducting loops. The evidence for unconventional order-parameter symmetry in these materials is growing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00752291
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    Paper (German National Licenses)
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