A SLAVE-BOSON APPROACH TO FERROMAGNETISM IN THE LARGE-U HUBBARD-MODEL

被引：31
|
作者：
MOLLER, B
DOLL, K
FRESARD, R
机构：
[1] Inst. fur Theor. der Kondensierten Materie, Karlsruhe Univ.
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 1993年 / 5卷 / 27期
关键词：
D O I：
10.1088/0953-8984/5/27/029
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We determine the ground-state phase diagram of the Hubbard model on the square lattice allowing for homogeneous spiral, antiferromagnetic, ferromagnetic and paramagnetic phases in the overall parameter range. This is obtained from a saddle-point approximation of a spin-rotation-invariant form of the slave-boson representation introduced by Kotliar and Ruckenstein. In addition we determine analytically the transition point for infinite repulsive interaction strength between the Nagaoka state and the paramagnetic state on any bipartite lattice.
引用
收藏
页码：4847 / 4854
页数：8
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