Correlated-Electron Theory of Strongly Anisotropic Metamagnets

Details Correlated-Electron Theory of Strongly Anisotropic Metamagnets Correlated-Electron Theory of Strongly Anisotropic Metamagnets

1995-05-29

arxiv.org/abs/cond-mat/9505147v1

Mod. Phys. Lett. B 10, 203 (1996)

Physics

Condensed Matter

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

Scientific paper

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.

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