Werthamer–Helfand–Hohenberg theory

In physics, The Werthamer–Helfand–Hohenberg (WHH) theory was proposed in 1966 by N. Richard Werthamer, Eugene Helfand and Pierre Hohenberg^[1] to go beyond BCS theory of superconductivity and it provides predictions of upper critical field (H_c2) in type-II superconductors.^[1][2] The theory predicts the upper critical field (H_c2) at 0 K from T_c and the slope of H_c2 at T_c.