Archivio Istituzionale della RicercaPhase 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, Carla. - In: MOLECULAR CRYSTALS AND LIQUID CRYSTALS. - ISSN 1056-8816. - 199:(1991), pp. 419-427. [10.1080/00268949108030951]
Reorientation transitions
BUZANO, Carla
1991
Abstract
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.
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https://hdl.handle.net/11583/1397852
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