Phase transitions of a quantum spin-1 king-Heisenberg model with uniaxial and single-ion anisotropy and with quadrupolar interactions are investigated by mean-field approximation. After the determination of the free energy, a Landau expansion is performed in order to analytically identify the critical temperatures. In some cases, for non-zero values of the anisotropy terms, first order reorientation transitions have been found. The influence of the quadrupolar interaction term on them is analyzed.
Reorientation transitions / Buzano C.. - In: MOLECULAR CRYSTALS AND LIQUID CRYSTALS. - ISSN 1056-8816. - 199(1991), pp. 419-427.
Titolo: | Reorientation transitions |
Autori: | |
Data di pubblicazione: | 1991 |
Rivista: | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1080/00268949108030951 |
Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/11583/1397852