Universal alternating order around impurities in antiferromagnets

The study of impurities in antiferromagnets is of considerable interest in condensed matter physics. In this Letter we address the elementary question of the effect of vacancies on the orientation of the surrounding magnetic moments in an antiferromagnet. In the presence of a magnetic field, alterna...

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Bibliographic Details
Published in:Physical review letters 2007-08, Vol.99 (9), p.097204-097204, Article 097204
Main Authors: Eggert, Sebastian, Syljuåsen, Olav F, Anfuso, Fabrizio, Andres, Markus
Format: Article
Language:English
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Summary:The study of impurities in antiferromagnets is of considerable interest in condensed matter physics. In this Letter we address the elementary question of the effect of vacancies on the orientation of the surrounding magnetic moments in an antiferromagnet. In the presence of a magnetic field, alternating magnetic moments are induced, which can be described by a universal expression that is valid in any ordered antiferromagnet and turns out to be independent of temperature over a large range. The universality is not destroyed by quantum fluctuations, which is demonstrated by quantum Monte Carlo simulations of the two-dimensional Heisenberg antiferromagnet. Physical predictions for finite doping are made, which are relevant for experiments probing Knight shifts and the order parameter.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.99.097204