The quantum easy-plane XXZ model is approached by the PQSCHA method, that reduces it to an effective classical model. Quantum fluctuations weaken the effective exchange leading to a reduced Kosterlitz-Thouless transition temperature. Moreover, the weakening of the effective easy-plane anisotropy can even lead to a quantum mechanical suppression of the transition.
THE QUANTUM 2-D XXZ FERROMAGNET / A. CUCCOLI; V. TOGNETTI; P. VERRUCCHI; R. VAIA. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - STAMPA. - 140:(1995), pp. 1703-1704. [10.1016/0304-8853(94)00915-5]
THE QUANTUM 2-D XXZ FERROMAGNET
CUCCOLI, ALESSANDRO;TOGNETTI, VALERIO;
1995
Abstract
The quantum easy-plane XXZ model is approached by the PQSCHA method, that reduces it to an effective classical model. Quantum fluctuations weaken the effective exchange leading to a reduced Kosterlitz-Thouless transition temperature. Moreover, the weakening of the effective easy-plane anisotropy can even lead to a quantum mechanical suppression of the transition.
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