Correlated-Electron Theory of Strongly Anisotropic Metamagnets
arXiv:cond-mat/9505147 · doi:10.1142/S0217984996000249
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