Correlated-electron theory of metamagnetism in strongly anisotropic antiferromagnets

被引：16

作者：

Held, K ^{[1
]}

Ulmke, M ^{[1
]}

Vollhardt, D ^{[1
]}

机构：

[1] FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, D-52425 JULICH, GERMANY

来源：

MODERN PHYSICS LETTERS B | 1996年 / 10卷 / 06期

关键词：

D O I：

10.1142/S0217984996000249

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The electronic origin of metamagnetism in strongly anisotropic antiferromagnets is examined. To this end the infinite-dimensional Hubbard model with easy axis is investigated both analytically and numerically. At weak coupling a first order transition and at strong coupling a second order phase transition is found. To determine the transition behavior at intermediate coupling Quantum Monte Carlo techniques are used to calculate the held versus temperature phase diagram. The apparent similarities to the phase diagram of FeBr2 and to mean field results for the Ising model with competing interactions are discussed.

引用

页码：203 / 210

页数：8

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