COLLECTIVE MODES AND SUPERCONDUCTIVITY IN AN EXTENDED HUBBARD-MODEL FOR COPPER-OXIDE SUPERCONDUCTORS

被引：65
|
作者：
LITTLEWOOD, PB
机构：
[1] AT and T Bell Laboratories, Murray Hill
来源：
PHYSICAL REVIEW B | 1990年 / 42卷 / 16期
关键词：
D O I：
10.1103/PhysRevB.42.10075
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A three-band extended Hubbard model for CuO2 planes is explored within a self-consistent-field approximation. The collective modes for both charge and spin fluctuations are calculated, including leading-order self-energy corrections for the quasiparticle propagators; this leads to an approximate form for the renormalized quasiparticle interactions, used to study superconductive pairing. We find that spin fluctuations promote pairing of B1g symmetry (dx2-y2), and charge fluctuations between Cu and O induce either A1g (extended s) or B2g (dxy) pairing. © 1990 The American Physical Society.
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页码：10075 / 10089
页数：15
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