Resonance-valence-bond superconductivity in CuO2 planes

被引：5

作者：

Batista, CD ^{[1
]}

Aligia, AA ^{[1
]}

机构：

[1] COMIS NACL ENERGIA ATOM,INST BALSEIRO,RA-8400 SAN CARLOS BARILO,RIO NEGRO,ARGENTINA

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 1996年 / 105卷 / 3-4期

关键词：

D O I：

10.1007/BF00768448

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We find the exact ground state of a system of 4 x 4 unit cells described by an effective model for cuprate superconductors. The model has the form of the t - J one, but includes a three-site term t '' like that derived from the Hubbard model in the large U limit, but of opposite sign for realistic or large O-O hopping. For t '' > t ''(c) (where t ''(c)/t similar to 0.1 for realistic J and doping) the system undergoes a transition to a phase in which the ground state has a significant overlap with a very simple superconducting resonance-valence-bond (RVB) wave function. In the RVB phase there is a large increase of the d-wave superconducting susceptibility. We calculate the boundary of the RVB phase.

引用

页码：591 / 596

页数：6

共 20 条

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