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

Author

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  • M. Mercaldo
  • I. Rabuffo
  • L. Cesare
  • A. Caramico D’Auria

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. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Suggested Citation

  • M. Mercaldo & I. Rabuffo & L. Cesare & A. Caramico D’Auria, 2013. "Magnetic-field-induced quantum criticality in a spin-S planar ferromagnet with single-ion anisotropy," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 86(8), pages 1-10, August.
    • Handle: RePEc:spr:eurphb:v:86:y:2013:i:8:p:1-10:10.1140/epjb/e2013-40407-6
    DOI: 10.1140/epjb/e2013-40407-6
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    Solid State and Materials;

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