Effect of an interband interaction on narrow-band superconductivity
Ajay, S. Patra, R. S. Tripathi
DOI 10.1103/PhysRevB.51.12658 · Physical Review B
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Abstract
The effect of an interband interaction (Usd) on narrow-band superconductivity in the presence of weak hybridization has been studied by extending the Anderson lattice Hamiltonian. We have employed Zubarev’s double-time Green’s-function technique and used a mean-field decoupling scheme to obtain the self-consistent expressions for the transition temperature (Tc) and interband correlation parameter (γc). The Tc is found to be dependent on both the interband interaction and on the strength of the hybridization between s- (or p-) and d-band electrons (within a two-band model). We have shown that the interband interaction (Usd) plays qualitatively the same role as that of hybridization (V). Finally, we have explained the relevance of our results in transition metals or electron-doped high-Tc superconductors under externally applied pressure.
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