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Disorder and impurities in hubbard-antiferromagnets

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Advances in Solid State Physics 38

Part of the book series: Advances in Solid State Physics ((ASSP,volume 38))

Abstract

We study the influence of disorder and randomly distributed impurities on the properties of correlated antiferromagnets. To this end the Hubbard model with (i) random potentials, (ii) random hopping elements, and (iii) randomly distributed values of interaction is treated using quantum Monte Carlo and dynamical mean-field theory. In cases (i) and (iii) weak disorder can lead to an enhancement of antiferromagnetic (AF) order: in case (i) by a disorder-induced delocalization, in case (iii) by binding of free carriers at the impurities. For strong disorder or large impurity concentration antiferromagnetism is eventually destroyed. Random hopping leaves the local moment stable but AF order is suppressed by local singlet formation. Random potentials induce impurity states within the charge gap until it eventually closes. Impurities with weak interaction values shift the Hubbard gap to a density off half-filling. In both cases an antiferromagnetic phase without charge gap is observed.

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Author information

Author notes

  1. A. Singh

    Present address: Department of Physics, Indian Institute of Technology, 208016, Kanpur

Authors and Affiliations

  1. Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Insitut für Physik, Universität Augsburg, 86135, Augsburg, Germany

    M. Ulmke, A. Singh & D. Vollhardt

  2. Lorentz Institute for Theoretical Physics, University of Leiden, P.O. Box 9506, 2300 RA, Leiden, The Netherlands

    P. J. H. Denteneer

  3. Institute of Physics, Academy of Sciences of the Czech Republik, CZ 18040, Praha 8, Czech Republik

    V. Janiš

  4. Department of Physics, University of California, 95616, Davis, CA, USA

    R. T. Scalettar & G. T. Zimanyi

Authors
  1. M. Ulmke
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  2. P. J. H. Denteneer
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  3. V. Janiš
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  4. R. T. Scalettar
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  5. A. Singh
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  6. D. Vollhardt
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  7. G. T. Zimanyi
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Bernhard Kramer

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© 1999 Friedr. Vieweg & Sohn Verlagsgesellschaft mbH

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Ulmke, M. et al. (1999). Disorder and impurities in hubbard-antiferromagnets. In: Kramer, B. (eds) Advances in Solid State Physics 38. Advances in Solid State Physics, vol 38. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0107630

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  • DOI: https://doi.org/10.1007/BFb0107630

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-41575-6

  • Online ISBN: 978-3-540-44558-6

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