Giant superconducting anisotropy in Bi 2 Sr 2 <mml:math …
1989; American Physical Society; Volume: 63; Issue: 7 Linguagem: Inglês
10.1103/physrevlett.63.782
ISSN1092-0145
AutoresD. E. Farrell, S. Bonham, Jason M. Foster, Y. C. Chang, P. Z. Jiang, K. G. Vandervoort, D. J. Lam, V. G. Kogan,
Tópico(s)Iron-based superconductors research
ResumoUsing torque magnetometry, the superconducting anisotropy of a single crystal of ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{Ca}}_{1}$${\mathrm{Cu}}_{2}$${\mathrm{O}}_{8+\mathrm{\ensuremath{\delta}}}$ has been measured in the temperature range 77.5<T<83 K (${T}_{c}$=85 K). The data provide direct experimental evidence for a giant anisotropy. A London analysis provides an excellent description of the results and establishes a temperature-independent value of 3\ifmmode\times\else\texttimes\fi{}${10}^{3}$ for the superconducting effective-mass anisotropy.
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