We analyze the effects induced by single-ion anisotropy on quantum criticality in a d-dimensional spin-3/2 planar ferromagnet. To tackle this problem we employ the two-time Green's function method, using the Tyablikov decoupling for exchange interactions and the Anderson-Callen decoupling for single-ion anisotropy. In our analysis the role of non-thermal control parameter which drives the quantum phase transition is played by a longitudinal external magnetic field. We find that the single-ion anisotropy has sensible effects on the structure of the phase diagram close to the quantum critical point.

Magnetic-field-induced quantum criticality in a planar ferromagnet with single-ion anisotropy

MERCALDO, Maria Teresa;RABUFFO, Ileana;DE CESARE, Luigi;
2014

Abstract

We analyze the effects induced by single-ion anisotropy on quantum criticality in a d-dimensional spin-3/2 planar ferromagnet. To tackle this problem we employ the two-time Green's function method, using the Tyablikov decoupling for exchange interactions and the Anderson-Callen decoupling for single-ion anisotropy. In our analysis the role of non-thermal control parameter which drives the quantum phase transition is played by a longitudinal external magnetic field. We find that the single-ion anisotropy has sensible effects on the structure of the phase diagram close to the quantum critical point.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4515057
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