%0 Book Section %1 statphys23_0398 %A Cuccoli, A. %A Gori, G. %A Vaia., R. %A Verrucchi, P. %B Abstract Book of the XXIII IUPAP International Conference on Statistical Physics %C Genova, Italy %D 2007 %E Pietronero, Luciano %E Loreto, Vittorio %E Zapperi, Stefano %K antiferromagnet kosterlitz-thouless montecarlo quantum semiclassical simulation statphys23 theory topic-2 transition %T The quantum two-dimensional Heisenberg antiferromagnet in a magnetic field %U http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=398 %X The 2D Heisenberg antiferromagnet experiences an effective easy-plane anisotropy when a magnetic field is applied, giving rise to Berezinskii-Kosterlitz-Thouless (BKT) critical behavior. Remarkably, the strength of the effective anisotropy, and consequently the critical BKT temperature, can be tuned by varying the field. By means of the pure-quantum self-consistent harmonic approximation, that reduces the quantum model to an effective classical system, the phase diagram is constructed from its known classical counterpart. By classical Monte Carlo simulations of the effective system the thermodynamic quantities can be calculated. Comparison is made with the behavior observed experimentally in the $S=5/2$ compound Mn(HCOO)$_2$2H$_2$O.

@incollection{statphys23_0398, abstract = {The 2D Heisenberg antiferromagnet experiences an effective easy-plane anisotropy when a magnetic field is applied, giving rise to Berezinskii-Kosterlitz-Thouless (BKT) critical behavior. Remarkably, the strength of the effective anisotropy, and consequently the critical BKT temperature, can be tuned by varying the field. By means of the pure-quantum self-consistent harmonic approximation, that reduces the quantum model to an effective classical system, the phase diagram is constructed from its known classical counterpart. By classical Monte Carlo simulations of the effective system the thermodynamic quantities can be calculated. Comparison is made with the behavior observed experimentally in the $S=5/2$ compound Mn(HCOO)$_2$2H$_2$O.}, added-at = {2007-06-20T10:16:09.000+0200}, address = {Genova, Italy}, author = {Cuccoli, A. and Gori, G. and Vaia., R. and Verrucchi, P.}, biburl = {https://www.bibsonomy.org/bibtex/20f28931ff98e2b35478e65554b8b19a4/statphys23}, booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics}, editor = {Pietronero, Luciano and Loreto, Vittorio and Zapperi, Stefano}, interhash = {5d13bf0978c42cbffc6c66678acf95a7}, intrahash = {0f28931ff98e2b35478e65554b8b19a4}, keywords = {antiferromagnet kosterlitz-thouless montecarlo quantum semiclassical simulation statphys23 theory topic-2 transition}, month = {9-13 July}, timestamp = {2007-06-20T10:16:19.000+0200}, title = {The quantum two-dimensional Heisenberg antiferromagnet in a magnetic field}, url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=398}, year = 2007 }