Werthamer–Helfand–Hohenberg theory

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In physics, The Werthamer–Helfand–Hohenberg (WHH) theory was proposed in 1966 by N. Richard Werthamer, Eugene Helfand and Pierre Hohenberg to go beyond BCS theory of superconductivity and it provides predictions of upper critical field (Hc2) in type-II superconductors. The theory predicts the upper critical field (Hc2) at 0 K from Tc and the slope of Hc2 at Tc.

References

1. ^ a b 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.
2. ^ 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. S2CID 250852195.

v t e Superconductivity
Theories	BCS Bean's critical state Ginzburg–Landau Kohn–Luttinger London Matthias Mattis–Bardeen RVB WHH
Characteristic parameters	coherence length critical field London penetration depth Silsbee current
Phenomena	Abrikosov vortices Andreev reflection Cooper pairs flux pinning flux pumping Josephson effect Little–Parks effect Meissner effect Homes's law persistent currents proximity effect reentrance SU(2) color supercurrents superdiamagnetism superstripes
Classification	By magnetic response Types I II 1.5 ferromagnetic By explanation conventional unconventional By critical temperature low temperature high temperature room temperature By composition covalent cuprates heavy fermion iron-based oxypnictides organic
Technological applications	cryotron electromagnets MRI NMR quantum computing Rutherford cable SQUID wires
List of superconductors	bilayer graphene BSCCO LBCO MgB2 NbSn NbTi TBCCO YBCO more...

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