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

  • M. T. Mercaldo
  • I. Rabuffo
  • L. De Cesare
  • A. Caramico D’Auria
Regular Article

Abstract

The effects of single-ion anisotropy on quantum criticality in a d-dimensional spin-S planar ferromagnet is explored by means of the two-time Green’s function method. We work at the Tyablikov decoupling level for exchange interactions and the Anderson-Callen decoupling level for single-ion anisotropy. In our analysis a longitudinal external magnetic field is used as the non-thermal control parameter and the phase diagram and the quantum critical properties are established for suitable values of the single-ion anisotropy parameter D. We find that the single-ion anisotropy has sensible effects on the structure of the phase diagram close to the quantum critical point. However, for values of the uniaxial crystal-field parameter below a positive threshold, the conventional magnetic-field-induced quantum critical scenario remains unchanged.

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • M. T. Mercaldo
    • 1
    • 2
  • I. Rabuffo
    • 1
    • 2
  • L. De Cesare
    • 1
    • 2
  • A. Caramico D’Auria
    • 3
  1. 1.Dipartimento di Fisica “E.R. Caianiello”Università di SalernoFiscianoItaly
  2. 2.CNISM, Unità di SalernoFisciano (Salerno)Italy
  3. 3.Dipartimento di FisicaUniversità di Napoli Federico IINapoliItaly

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