DISORDER VS INTERACTION IN THE HUBBARD-MODEL - PHASE-DIAGRAM IN INFINITE DIMENSIONS

被引:18
作者
JANIS, V [1 ]
ULMKE, M [1 ]
VOLLHARDT, D [1 ]
机构
[1] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, D-52425 JULICH, GERMANY
来源
EUROPHYSICS LETTERS | 1993年 / 24卷 / 04期
关键词
D O I
10.1209/0295-5075/24/4/009
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The influence of local disorder on the thermodynamics of interacting electrons is studied within the infinite-dimensional disordered Hubbard model. Using a finite-temperature quantum Monte Carlo method, the averaged local moment and staggered susceptibility are calculated and the magnetic phase diagram at half-filling is constructed. From the averaged compressibility in the paramagnetic and antiferromagnetic phase we determine the metal-insulator transitions of the system. A rich transition scenario is revealed. Quite unexpectedly the disorder is found to stabilize the magnetic order in the strong-coupling limit.
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页码:287 / 292
页数:6
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