Field-induced Antiferromagnetism and the Kondo Insulator-to-Metal Transition

Details Field-induced Antiferromagnetism and the Kondo Insulator-to-Metal Transition Field-induced Antiferromagnetism and the Kondo Insulator-to-Metal Transition

2003-06-12

arxiv.org/abs/cond-mat/0306336v1

Phys. Rev. Lett. 92, 026401 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

RevTex 4, 5 pages, 4 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.92.026401

The Kondo lattice model, augmented by a Zeeman term, serves as a useful model of a Kondo insulator in an applied magnetic field. A variational mean field analysis of this system on a square lattice, backed up by quantum Monte Carlo calculations, reveals an interesting separation of magnetic field scales. For Zeeman energy comparable to the Kondo energy, the spin gap closes and the system develops transverse staggered magnetic order. The charge gap, however, survives up to a higher hybridization energy scale, at which point the canted antiferromagnetism is suppressed and the system becomes metallic. Quantum Monte Carlo simulations support this mean field scenario. An interesting rearrangement of spectral weight with magnetic field is found.

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