SPIRAL MAGNETIC STATES IN THE LARGE-U-HUBBARD MODEL - A SLAVE BOSON APPROACH

被引：77

作者：

FRESARD, R

WOLFLE, P

机构：

[1] Inst. fur Theorie der Kondensierten Materie, Karlsruhe Univ.

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1992年 / 4卷 / 13期

关键词：

D O I：

10.1088/0953-8984/4/13/022

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. This is obtained from a saddle-point approximation of a spin-rotation-invariant form of the slave boson representation introduced by Kotliar and Ruckenstein. We obtain very good agreement in energy with exact diagonalization calculations and, concerning the magnetic structure, qualitative agreement with experimental data.

引用

页码：3625 / 3638

页数：14

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