EFFECTIVE SINGLET-TRIPLET MODEL FOR CUO2 PLANE IN OXIDE SUPERCONDUCTORS - THE CHARGE FLUCTUATION REGIME

被引：43
|
作者：
LOVTSOV, SV [1 ]
YUSHANKHAI, VY [1 ]
机构：
[1] JOINT INST NUCL RES,THEORET PHYS LAB,MOSCOW,USSR
来源：
PHYSICA C | 1991年 / 179卷 / 1-3期
关键词：
D O I：
10.1016/0921-4534(91)90024-S
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A reduction from the two-band Emery model to an effective Hamiltonian describing low-energy properties of the CuO2 plane in oxide superconductors is presented. The approach is based on an expansion in the inter-site p-d hybridization amplitude 2-lambda-(ij)t(dp) (lambda-ij less-than-or-equal-to 0.14) between a Cu-orbital and a symmetric O-orbital in the Wannier representation. The resulting Hamiltonian is presented in terms of Hubbard operators for singlet and triplet local states. A further reduction to the single-band t-J model seems to be plausible.
引用
收藏
页码：159 / 166
页数：8
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