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Dynamical Mean Field Theory of the Antiferromagnetic Metal to Antiferromagnetic Insulator Transition

1999; American Physical Society; Volume: 83; Issue: 12 Linguagem: Inglês

10.1103/physrevlett.83.2386

1092-0145

R. Chitra, Gabriel Kotliar,

Theoretical and Computational Physics

We study the antiferromagnetic metal to antiferromagnetic insulator using dynamical mean field theory and exact diagonalization methods. We find two qualitatively different behaviors depending on the degree of magnetic correlations. For strong correlations combined with magnetic frustration, the transition can be described in terms of a renormalized slater theory, with a continuous gap closure driven by the magnetism but strongly renormalized by correlations. For weak magnetic correlations, the transition is weakly first order.