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Field induced magnetic ordering transition in Kondo insulators

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Abstract.

We study the 2D Kondo insulators in a uniform magnetic field using quantum Monte Carlo simulations of the particle-hole symmetric Kondo lattice model and a mean field analysis of the Periodic Anderson model. We find that the field induces a transition to an insulating, antiferromagnetically ordered phase with staggered moment in the plane perpendicular to the field. For fields in excess of the quasi-particle gap, corresponding to a metal in a simple band picture of the periodic Anderson model, we find that the metallic phase is unstable towards the spin density wave type ordering for any finite value of the interaction strength. This can be understood as a consequence of the perfect nesting of the particle and hole Fermi surfaces that emerge as the field closes the gap. We propose a phase diagram and investigate the quasi-particle and charge excitations in the magnetic field. We find good agreement between the mean-field and quantum Monte Carlo results.

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Authors and Affiliations

  1. Theoretische Physik, ETH-Hönggerberg, 8093, Zürich, Switzerland

    I. Milat, F. Assaad & M. Sigrist

  2. Universität Würzburg, Am Hubland, 97074, Würzburg, Germany

    F. Assaad

Authors
  1. I. Milat
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  2. F. Assaad
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  3. M. Sigrist
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Corresponding author

Correspondence to I. Milat.

Additional information

Received: 17 December 2003, Published online: 8 June 2004

PACS:

71.27. + a Strongly correlated electron systems; heavy fermions - 71.10.Fd Lattice fermion models (Hubbard model, etc.) - 71.30. + h Metal-insulator transitions and other electronic transitions - 75.30.Mb Valence fluctuation, Kondo lattice, and heavy-fermion phenomena - 75.30.Fv Spin-density waves

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Milat, I., Assaad, F. & Sigrist, M. Field induced magnetic ordering transition in Kondo insulators. Eur. Phys. J. B 38, 571–580 (2004). https://doi.org/10.1140/epjb/e2004-00154-5

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  • DOI: https://doi.org/10.1140/epjb/e2004-00154-5

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