SELF-CONSISTENT-FIELD STUDIES OF THE NEGATIVE-U HUBBARD-MODEL

被引:21
|
作者
LUO, J
BICKERS, NE
机构
[1] Department of Physics, University of Southern California, Los Angeles
来源
PHYSICAL REVIEW B | 1993年 / 48卷 / 21期
关键词
D O I
10.1103/PhysRevB.48.15983
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The phase boundary between normal and superconducting phases of the negative-U Hubbard model is obtained within a self-consistent weak-coupling approach known as the ''pseudopotential parquet'' approximation. The shortcomings of simpler self-consistent approaches, including the Hartree-Fock and fluctuation-exchange approximations, are outlined. For intermediate values of U, pseudopotential parquet predicts (i) a maximum in the superconducting transition temperature T(c) at an electron filling [n] of approximately 0.92; and (ii) a sharp decrease in T(c) for values of [n] closer to 1. The scale of transition temperatures is consistent with results from quantum simulations.
引用
收藏
页码:15983 / 15991
页数:9
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