INSTABILITY OF THE NAGAOKA FERROMAGNETIC STATE OF THE U=INFINITY HUBBARD-MODEL

被引：197

作者：

SHASTRY, BS ^{[1
]}

KRISHNAMURTHY, HR ^{[1
]}

ANDERSON, PW ^{[1
]}

机构：

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

来源：

PHYSICAL REVIEW B | 1990年 / 41卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.41.2375

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We identify a kF instability of the Nagaoka ferromagnetic state of the U= Hubbard model. We show rigorously that for a large enough hole concentration the ferromagnet possesses an instability with respect to overturning an up-spin electron at the Fermi surface and placing it at the bottom of a down-spin band made very narrow by correlation effects. We find a low-energy scale for spin waves in this strong-coupling limit, in the form of a spin-wave stiffness that is much smaller than its random-phase-approximation value. © 1990 The American Physical Society.

引用

页码：2375 / 2379

页数：5

共 18 条

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