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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/7619
Record Status
Checked
Record Id
7619
Title
The quantum easy-plane ferro- and antiferromagnet
Contributors
C Biagini
,
A Cuccoli
,
V Tognetti
,
R Vaia
,
P Verrucchi (CCLRC Rutherford Appleton Lab.)
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'
Organisation
CCLRC
,
ISIS
,
ISIS-THEORY
Keywords
ISIS 1996
,
ISIS 1996 Update
,
Physics
Funding Information
Related Research Object(s):
Licence Information:
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
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