Superconductivity in the transition metal series

X.Q. Hong and J.E. Hirsch, cond-mat/0102115 (Los Alamos), Phys. Rev. B 46, 14702 (1992)

We study the possibility of describing superconductivity in the transition metal series within the model of hole superconductivity. The band structures for transition metals are obtained within a tight binding scheme using the parameters calculated by Papaconstantopoulos, and a rigid band interpolation scheme is used to describe alloys. Bcc, hcp and fcc structures are considered. Under the assumption that superconductivity originates in the band with strongest hole-like character to the carriers at the Fermi surface, we obtain parameters in the model that reproduce the experimental values for $T_c$. The absence of superconductivity at the beginning of the transition metal series is naturally explained within this model. The possible effect of inter-band coupling within the model of Suhl et al. is also considered. Finally, the nature of the superconducting state and various observable properties are discussed.