Mercaldo, M.; Rabuffo, I.; Cesare, L.; A. Caramico D’Auria - In: The European Physical Journal B - Condensed Matter and … 86 (2013) 8, pp. 1-10
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...