Werthamer–Helfand–Hohenberg theory

This theory was proposed in 1966 
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.

eg Referred : re MgB2

References

Category:Superconductivity