Impurity induced order and moment distribution in quantum antiferromagnets

ORAL

Abstract

The local response to a uniform field around vacancies in antiferromagnetic lattice models is analyzed by using a combination of spin wave calculations, an effective continuous theory, and quantum Monte Carlo simulations. The impurity breaks the sublattice symmetry and causes a tilting of the order parameter towards the field over a large range. This corresponds to an induced antiferromagnetic order {\it parallel} to the applied field, which is understood in quantitative detail. The relevance for NMR and susceptibility measurements will be discussed.

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Authors

  • Sebastian Eggert

    • University of Kaiserslautern

  • Olav Syljuasen

    • Nordita

  • Fabrizio Anfuso

    • University of Cologne

  • Markus Andres

    • University of Kaiserslautern

  • Stellan Ostlund

    • University of Gothenburg