Hot spots and pseudogaps for hole- and electron-doped high-temperature superconductors -: art. no. 126401

被引：203

作者：

Sénéchal, D ^{[1
]}

Tremblay, AMS

机构：

[1] Univ Sherbrooke, Dept Phys, Sherbrooke, PQ J1K 2R1, Canada

[2] Univ Sherbrooke, Regroupement Quebecois Mat Pointe, Sherbrooke, PQ J1K 2R1, Canada

[3] Univ Sherbrooke, Inst Canadien Rech Avancees, Sherbrooke, PQ J1K 2R1, Canada

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 12期

基金：

加拿大自然科学与工程研究理事会; 加拿大创新基金会;

关键词：

D O I：

10.1103/PhysRevLett.92.126401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using cluster perturbation theory, it is shown that the spectral weight and pseudogap observed at the Fermi energy in recent angle resolved photoemission spectroscopy of both electron- and hole-doped high-temperature superconductors find their natural explanation within the t-t(')-t('')-U Hubbard model in two dimensions. The value of the interaction U needed to explain the experiments for electron-doped systems at optimal doping is in the weak to intermediate coupling regime where the t-J model is inappropriate. At strong coupling, short-range correlations suffice to create a pseudogap, but at weak-coupling long correlation lengths associated with the antiferromagnetic wave vector are necessary.

引用

页码：126401 / 1

页数：4

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