Correlated-Electron Theory of Strongly Anisotropic Metamagnets
K. Held, M. Ulmke, D. Vollhardt
TL;DR
This paper develops a correlated-electron theoretical framework for understanding metamagnetism in strongly anisotropic antiferromagnets, using Quantum-Monte-Carlo methods to analyze phase diagrams.
Contribution
It introduces the first correlated-electron theory for metamagnetism in anisotropic antiferromagnets, employing Quantum-Monte-Carlo techniques on the Hubbard model.
Findings
Identification of first-order and second-order phase transitions in the phase diagram.
Comparison of theoretical results with experimental phase diagrams of FeBr2.
Insights into the similarity between the Hubbard model results and mean-field Ising model predictions.
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 and to mean-field results for the Ising model with competing interactions are discussed.
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