The S = 1/2 quantum Heisenberg antiferromagnet on the square lattice in a uniform arbitrary magnetic field is studied by means of quantum Monte Carlo simulations. The applied field induces an effective easy-plane anisotropy and consequently a Berezhinskii-Kosterlitz-Thouless (BKT) transition: the expected BKT behaviour is observed to persist both in the limit of vanishing field and near the saturation field. Experimental implications are discussed.
XY behaviour of the 2D S=1/2 antiferromagnet in a field / A. CUCCOLI; ROSCILDE T.; VAIA R.; VERRUCCHI P.. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - STAMPA. - 272-276:(2004), pp. 884-885. [10.1016/j.jmmm.2003.12.605]
XY behaviour of the 2D S=1/2 antiferromagnet in a field
CUCCOLI, ALESSANDRO;
2004
Abstract
The S = 1/2 quantum Heisenberg antiferromagnet on the square lattice in a uniform arbitrary magnetic field is studied by means of quantum Monte Carlo simulations. The applied field induces an effective easy-plane anisotropy and consequently a Berezhinskii-Kosterlitz-Thouless (BKT) transition: the expected BKT behaviour is observed to persist both in the limit of vanishing field and near the saturation field. Experimental implications are discussed.
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