The low temperature critical properties and crossovers of a spin 1/2 planar ferromagnet in a longitudinal magnetic field are explored in terms of an anisotropic bosonic action, suitable to describe the spin model in the low temperature regime. This is performed adopting a procedure which combines an averaging over dynamic degrees of freedom and the classical Wilson renormalization transformation. We get the phase boundary, ending in a quantum critical point, and general expressions for the correlation lenght and the susceptibility within the disordered phase.
Field-induced quantum criticality of a spin 1/2 planar ferromagnet / M. T., Mercaldo; I., Rabuffo; CARAMICO D'AURIA, Alvaro; L., De Cesare. - STAMPA. - 150:(2009), pp. 042123/1-042123/4. (Intervento presentato al convegno International Conference on Low Temperatur Physics (LT25) tenutosi a Amsterdam nel 6-13 Agosto 2008) [10.1088/1742-6596/150/4/042123].
Field-induced quantum criticality of a spin 1/2 planar ferromagnet
CARAMICO D'AURIA, ALVARO;
2009
Abstract
The low temperature critical properties and crossovers of a spin 1/2 planar ferromagnet in a longitudinal magnetic field are explored in terms of an anisotropic bosonic action, suitable to describe the spin model in the low temperature regime. This is performed adopting a procedure which combines an averaging over dynamic degrees of freedom and the classical Wilson renormalization transformation. We get the phase boundary, ending in a quantum critical point, and general expressions for the correlation lenght and the susceptibility within the disordered phase.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.