Reentrant phenomena in a three-dimensional spin-1 planar ferromagnet with easy-axis single-ion anisotropy

• Published in: Journal of magnetism and magnetic materials 2014-09, Vol.364, p.85-94
• Main Authors: Mercaldo, M.T., Rabuffo, I., De Cesare, L., Caramico D׳Auria, A.
• Format: Article
• Language: English
• Subjects: Anisotropy; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical-point effects, specific heats, short-range order; Decoupling; Exact sciences and technology; Exchange; Ferromagnetism; Green's functions; Magnetic properties and materials; Magnetism; Numerical simulation studies; Phase diagrams; Physics; Planar ferromagnet; Quantum criticality; Reentrant phenomenon; Single-ion anisotropy; Three dimensional; Two-time Green׳s function
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2014.04.011

The two-time Green function method is employed to explore the phase diagram and the magnetic-field-induced quantum criticality of a three-dimensional spin-one planar ferromagnet with easy-axis single-ion 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. •We study he effects of single-ion anisotropy on the magnetic-field-induced quantum criticality.•The method used is the two-time Green׳s function framework.•We find that the structure of the phase diagram is modified.•Reentrant critical lines appear in a given range of the anisotropy parameter values.