Orbital upper critical field and its anisotropy of clean one- and two-band superconductors
Orbital upper critical field and its anisotropy of clean one- and two-band superconductors
The Helfand-Werthamer (HW) scheme (Helfand and Werthamer 1966 Phys. Rev. 147 288; another part of this work published as a separate paper by Werthamer et al 1966 Phys. Rev. 147 295) of evaluating the orbital upper critical field is generalized to anisotropic superconductors in general, and to two-band clean materials, …