Polaron cross-overs and d-wave superconductivity in Hubbard-Holstein model

Details Polaron cross-overs and d-wave superconductivity in Hubbard-Holstein model Polaron cross-overs and d-wave superconductivity in Hubbard-Holstein model

2006-11-14

arxiv.org/abs/cond-mat/0611355v1

Eur. Phys. J. B 41, 197 (2004)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1140/epjb/e2004-00309-4

We present a theoretical study of superconductivity of polarons in the Hubbard-Holstein model. A residual kinematic interaction proportional to the square of the polaron hopping energy between polarons and phonons provides a pairing field for the polarons. We find that superconducting instability in the d-wave channel is possible with small transition temperatures which is maximum in the large to small polaron cross-over region. An s-wave instability is found to be not possible when the effective on-site interaction between polarons is repulsive.

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