Vortex-enhanced alternating order around impurities in antiferromagnets
Strongly Correlated Electrons
2008-06-11 v1
Abstract
It has been recently pointed out that the presence of a nonmagnetic impurity in a Heisenberg antiferromagnet generates an alternating order of the surrounding spins which is independent of temperature in a wide range. Quantum Monte Carlo simulations in the two-dimensional case confirmed this picture, but showed a counterintuitive enhancement of the alternating order around the Kosterlitz-Thouless transition. We propose here an explanation in terms of the effect of vortex excitations.
Cite
@article{arxiv.0806.1713,
title = {Vortex-enhanced alternating order around impurities in antiferromagnets},
author = {Ruggero Vaia and Alessandro Cuccoli},
journal= {arXiv preprint arXiv:0806.1713},
year = {2008}
}
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2 pages