Superconductivity in multiband disordered systems: A vector recursion approach

Shreemoyee Ganguly; Indra Dasgupta; Abhijit Mookerjee

doi:10.1103/PhysRevB.84.174508

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Superconductivity in multiband disordered systems: A vector recursion approach

Shreemoyee Ganguly, Indra Dasgupta, Abhijit Mookerjee

DOI 10.1103/PhysRevB.84.174508 · Physical Review B

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Abstract

We present a vector recursion based approach to study the effect of disorder on superconductivity in a system modeled by the two-band attractive Hubbard model. We use the augmented space formalism for the disorder averaging. In the presence of only intraband pairing in a two-band disordered system with disorder in either or both bands, our calculations reveal that the gap survives in the quasiparticle spectrum; similar to single band systems. However, for interband pairing the gap in the quasiparticle spectrum ceases to exist beyond a critical value of the disorder strength. In the presence of both interband and intraband pairing interaction, depending on the relative magnitude of the pairing strength, only a particular kind of pairing is possible for a half filled two-band system.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
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