This theory was proposed in 1966[1] to go beyond BCS theory of superconductivity and it provides predictions of upper critical field (Hc2) in type-II superconductors.[1][2] The theory predicts the upper critical field (Hc2) at 0 K from Tc and the slope of Hc2 at Tc.
References
Werthamer, N. R; Helfand, E; Hohenberg, P. C (1966). "Temperature and Purity Dependence of the Superconducting Critical Field,Hc2. III. Electron Spin and Spin-Orbit Effects". Physical Review. 147 (1): 295–302. Bibcode:1966PhRv..147..295W. doi:10.1103/PhysRev.147.295.
Samuely, P; Szabó, P; Klein, T; Jansen, A. G. M; Marcus, J; Escribe-Filippini, C; Wyder, P (1998). "Upper critical field in Ba1 − xKxBiO3: Magnetotransport vs. Magnetotunneling". Europhysics Letters. 41 (2): 207–212. arXiv:cond-mat/0103183. Bibcode:1998EL.....41..207S. doi:10.1209/epl/i1998-00132-1.
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