Nonlocal Characteristics of the Bulk Upper Critical Field of Niobium
作者： S. J. Williamson , L. E. Valby
DOI: 10.1103/PHYSREVLETT.24.1061
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摘要: Measurements of the anisotropic critical field ${H}_{c2}$ Nb at temperatures down to 0.06 K show that its temperature dependence contains a logarithmic factor as predicted by Gor'kov on basis nonlocal theory for an isotropic type-II superconductor. The extrapolated zero temperature, when averaged over all crystallographic directions and normalized slope $T\ensuremath{\approx}{T}_{c}$, has enhancement close Hohenberg-Werthamer calculation effects Fermi-surface anisotropy, evaluated Mattheiss band model niobium.
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