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

被引：0
|
作者：
R. Ramakumar
A. N. Das
机构：
[1] Saha Institute of Nuclear Physics,Condensed Matter Physics Group
来源：
The European Physical Journal B - Condensed Matter and Complex Systems | 2004年 / 41卷
关键词：
Transition Temperature; Small Transition; Small Polaron; Kinematic Interaction; Pairing Field;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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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页码：197 / 200
页数：3
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