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Persistent URL http://purl.org/net/epubs/work/7619
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Record Id 7619
Title The quantum easy-plane ferro- and antiferromagnet
Abstract The Berezinskii-Kosterlitz-Thouless (BKT) phase transition is peculiar of twodimensional magnetic systems with easy-plane anisotropy. Their prototype is the classical planar (or XY) model, that neglects the role of the out-of-plane spin component. The latter is accounted for in the (easy-plane) XXZ model, that has been studied on a square two-dimensional lattice. From Monte Carlo simulation for the classical X X Z model the classical transition temperature T~';2T turns out to be considerably lower than that of the planar model. The quantum X X Z model is approached by the pure-quantum self-consistent harmonic approximation, which leads to the investigation of an effective classical model. Quantum fluctuations reduce the effective exchange interaction, resulting in a lower BKT transition temperature TBKT'
Keywords ISIS 1996 , ISIS 1996 Update , Physics
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Language English (EN)
Type Details URI(s) Local file(s) Year
Report RAL Technical Reports RAL-TR-95-054. CCLRC, 1995. RAL-TR-95-054.pdf 1995