Universal alternating order around impurities in antiferromagnets

Details Universal alternating order around impurities in antiferromagnets Universal alternating order around impurities in antiferromagnets

2007-05-31

arxiv.org/abs/0706.0002v1

Phys. Rev. Lett. 99, 097204 (2007).

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 2 figures. The most recent version in PDF format can be found at http://www.physik.uni-kl.de/eggert/papers/

Scientific paper

10.1103/PhysRevLett.99.097204

The study of impurities in antiferromagnets is of considerable interest in condensed matter physics. In this paper 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 fluctuation, which is demonstrated by quantum Monte Carlo simulations in the two-dimensional Heisenberg antiferromagnet. Physical predictions for finite doping are made, which are relevant for experiments probing Knight shifts and the order parameter.

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