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 FeBr2 and to mean-field results for the Ising model with competing interactions are discussed.
@article{arxiv.cond-mat/9505147,
title = {Correlated-Electron Theory of Strongly Anisotropic Metamagnets},
author = {K. Held and M. Ulmke and D. Vollhardt},
journal= {arXiv preprint arXiv:cond-mat/9505147},
year = {2015}
}
Comments
4 pages, RevTeX + one uuencoded ps-file including 3 figures