dx2-y2 superconductivity in a generalized Hubbard model

被引：28

作者：

Arrachea, L

Aligia, AA

机构：

[1] Pontificia Univ Catolica Rio de Janeiro, Dept Fis, BR-22452 Rio De Janeiro, Brazil

[2] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[3] Comis Nacl Energia Atom, Inst Balseiro, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

来源：

PHYSICAL REVIEW B | 1999年 / 59卷 / 02期

关键词：

D O I：

10.1103/PhysRevB.59.1333

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We consider an extended Hubbard model with nearest-neighbor correlated hopping and next-nearest-neighbor hopping t' obtained as an effective model for cuprate superconductors. Using a generalized Hartree-Fock BCS approximation, we find that for high enough t' and doping, antiferromagnetism is destroyed and the system exhibits d-wave superconductivity. Near optimal doping we consider the effect of antiferromagnetic spin fluctuations on the normal self-energy using a phenomenological susceptibility. The resulting superconducting critical temperature as a function of doping is in good agreement with experiment. [S0163-1829(99)06101-9].

引用

页码：1333 / 1338

页数：6

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[11] Temperature variation of the pseudogap in underdoped cuprates [J].