Incommensurate antiferromagnetic fluctuations in the two-dimensional Hubbard model

被引：12
|
作者：
Krahl, H. C. [1 ]
Friederich, S. [1 ]
Wetterich, C. [1 ]
机构：
[1] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 01期
关键词：
antiferromagnetism; d-wave superconductivity; fluctuations in superconductors; Hubbard model; renormalisation; superconducting transition temperature; RENORMALIZATION-GROUP; MAGNETISM; FIELD; WAVE; FERROMAGNETISM; LA2CUO4; PHASE;
D O I：
10.1103/PhysRevB.80.014436
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Commensurate and incommensurate antiferromagnetic fluctuations in the two-dimensional repulsive t-t(')-Hubbard model are investigated using functional renormalization group equations. For a sufficient deviation from half-filling we establish the existence of local incommensurate order below a pseudocritical temperature T-pc. Fluctuations not accounted for in the mean-field approximation are important-they lower T-pc by a factor approximate to 2.5.
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页数：7
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