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

被引：4
|
作者：
Ramakumar, R [1 ]
Das, AN [1 ]
机构：
[1] Saha Inst Nucl Phys, Condensed Matter Phys Grp, Kolkata 700064, W Bengal, India
来源：
EUROPEAN PHYSICAL JOURNAL B | 2004年 / 41卷 / 02期
关键词：
D O I：
10.1140/epjb/e2004-00309-4
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
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.
引用
收藏
页码：197 / 200
页数：4
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