Monte Carlo study of the anisotropic Heisenberg antiferromagnet on the triangular lattice

Authors
Stephan, W Southern, BW
Citation
W. Stephan et Bw. Southern, Monte Carlo study of the anisotropic Heisenberg antiferromagnet on the triangular lattice, PHYS REV B, 61(17), 2000, pp. 11514-11520
Citations number
23
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
10980121 → ACNP
Volume
61
Issue
17
Year of publication
2000
Pages
11514 - 11520
Database
ISI
SICI code
1098-0121(20000501)61:17<11514:MCSOTA>2.0.ZU;2-E
Abstract
We report a Monte Carlo study of the classical antiferromagnetic Heisenberg model with easy axis exchange anisotropy on the triangular lattice. Both t he free energy cost for long-wavelength spin waves as well as for the forma tion of free vortices are obtained from the spin stiffness and vorticity mo dulus, respectively. Evidence for two distinct Kosterlitz-Thouless types of defect-mediated phase transitions at finite temperatures is presented.