FERROMAGNETISM IN THE 2-DIMENSIONAL T-J MODEL

被引：80

作者：

PUTIKKA, WO

LUCHINI, MU

OGATA, M

机构：

[1] SWISS FED INST TECHNOL,CH-8093 ZURICH,SWITZERLAND

[2] PRINCETON UNIV,JOSEPH HENRY LABS PHYS,PRINCETON,NJ 08544

来源：

PHYSICAL REVIEW LETTERS | 1992年 / 69卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.69.2288

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The occurrence of ferromagnetism for the t-J model on a square lattice is investigated using high-temperature series for the Helmholtz free energy F and the uniform magnetic susceptibility chi0. For J=0 fourteenth-order series have been calculated for F and chi0 and we estimate F(T=0) to find the ground-state energy. A region of fully polarized ferromagnetism is found for J < 0. A ferrimagnetic region is observed for larger J/t where chi0 is divergent, but F(T=0) is below that of spinless fermions. Our results do not support Nagaoka's theorem at a thermodynamic density of holes.

引用

页码：2288 / 2291

页数：4

共 39 条

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