Critical Properties of the Half-Filled Hubbard Model in Three Dimensions

被引：102

作者：

Rohringer, G. ^{[1
]}

Toschi, A. ^{[1
]}

Katanin, A. ^{[2
,3
]}

Held, K. ^{[1
]}

机构：

[1] Vienna Univ Technol, Inst Solid State Phys, A-1040 Vienna, Austria

[2] Inst Met Phys, Ekaterinburg 620099, Russia

[3] Ural Fed Univ, Ekaterinburg 620002, Russia

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 25期

基金：

奥地利科学基金会;

关键词：

FERROMAGNETISM;

D O I：

10.1103/PhysRevLett.107.256402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

By means of the dynamical vertex approximation (D Gamma A) we include spatial correlations on all length scales beyond the dynamical mean-field theory (DMFT) for the half-filled Hubbard model in three dimensions. The most relevant changes due to nonlocal fluctuations are (i) a deviation from the mean-field critical behavior with the same critical exponents as for the three dimensional Heisenberg (anti) ferromagnet and (ii) a sizable reduction of the Neel temperature (T-N) by similar to 30% for the onset of antiferromagnetic order. Finally, we give a quantitative estimate of the deviation of the spectra between D Gamma A and DMFT in different regions of the phase diagram.

引用

页数：5

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