Biconical structures in two-dimensional anisotropic Heisenberg antiferromagnets
| dc.creator | Holtschneider, M. | |
| dc.creator | Selke, W. | |
| dc.date | 2007-10-05 | |
| dc.date | 2007-12-19 | |
| dc.date.accessioned | 2026-07-07T08:49:59Z | |
| dc.date.available | 2026-07-07T08:49:59Z | |
| dc.description | Square lattice Heisenberg and XY antiferromagnets with uniaxial anisotropy in a field along the easy axis are studied. Based on ground state considerations and Monte Carlo simulations, the role of biconical structures in the transition region between the antiferromagnetic and spin--flop phases is analyzed. In particular, adding a single--ion anisotropy to the XXZ antiferromagnet, one observes, depending on the sign of that anisotropy, either an intervening biconical phase or a direct transition of first order separating the two phases. In case of the anisotropic XY model, the degeneracy of the ground state, at a critical field, in antiferromagnetic, spin--flop, and bidirectional structures seems to result, as in the case of the XXZ model, in a narrow disordered phase between the antiferromagnetic and spin--flop phases, dominated by bidirectional fluctuations. | |
| dc.description | 4 pages, 5 figures, accepted by Phys. Rev. B | |
| dc.identifier | https://arxiv.org/abs/0710.1251 | |
| dc.identifier | http://arxiv.org/abs/0710.1251 | |
| dc.identifier | Phys. Rev. B 76, 220405(R) (2007) | |
| dc.identifier | doi:10.1103/PhysRevB.76.220405 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/144466 | |
| dc.subject | Statistical Mechanics | |
| dc.title | Biconical structures in two-dimensional anisotropic Heisenberg antiferromagnets | |
| dc.type | text |