The two-time Green function method is employed to explore the phase diagram and the magnetic-fieldinduced quantum criticality of a three-dimensional spin-one planar ferromagnet with easy-axis singleion anisotropy. We adopt the Tyablikov and Anderson-Callen decouplings for higher order exchange and single-ion anisotropy Green functions, respectively. The central finding is that, within a characteristic range of the anisotropy parameter values, reentrant phenomena occur in the phase diagram close to the quantum critical point producing a sensible change of the conventional quantum critical scenario.
Reentrant phenomena in a three-dimensional spin-1 planar ferromagnet with easy-axis single-ion anisotropy
MERCALDO, Maria Teresa;RABUFFO, Ileana;DE CESARE, Luigi;
2014
Abstract
The two-time Green function method is employed to explore the phase diagram and the magnetic-fieldinduced quantum criticality of a three-dimensional spin-one planar ferromagnet with easy-axis singleion anisotropy. We adopt the Tyablikov and Anderson-Callen decouplings for higher order exchange and single-ion anisotropy Green functions, respectively. The central finding is that, within a characteristic range of the anisotropy parameter values, reentrant phenomena occur in the phase diagram close to the quantum critical point producing a sensible change of the conventional quantum critical scenario.File in questo prodotto:
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