Correlated-Electron Theory of Strongly Anisotropic Metamagnets

Abstract

We present the first correlated-electron theory of metamagnetism in strongly anisotropic antiferromagnets. Quantum-Monte-Carlo techniques are used to calculate the field vs. temperature phase diagram of the infinite-dimensional Hubbard model with easy axis. A metamagnetic transition scenario with 1.~order and 2.~order phase transitions is found. The apparent similarities to the phase diagram of FeBr${}_2$ and to mean-field results for the Ising model with competing interactions are discussed.

4 pages, RevTeX + one uuencoded ps-file including 3 figures

Cited by in corpus (7)

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• The role of correlated hopping in many-body physics of flat-band systems: Nagaoka ferromagnetism
• Metamagnetism in the 2D Hubbard Model with easy axis