A one-loop renormalization group treatment is used to investigate the quantum phase transition and the low-temperature critical properties of a planar Heisenberg ferromagnet in a transverse field. The phase diagram, the free energy density and the relevant critical exponents in the influence domain of the quantum critical point are obtained for dimensionalities d>2 in the temperature regime where the quantum fluctuations dominate. The d = 2 criticality is also studied decreasing the temperature with the magnetic field fixed at its critical value.
QUANTUM CRITICALITY OF A PLANAR HEISENBERG FERROMAGNET IN A TRANSVERSE MAGNETIC FIELD / CARAMICO D'AURIA, Alvaro; L., DE CESARE; M. T., Mercaldo; I., Rabuffo. - In: PHYSICA. A. - ISSN 0378-4371. - STAMPA. - 351:(2005), pp. 294-314.
QUANTUM CRITICALITY OF A PLANAR HEISENBERG FERROMAGNET IN A TRANSVERSE MAGNETIC FIELD
CARAMICO D'AURIA, ALVARO;
2005
Abstract
A one-loop renormalization group treatment is used to investigate the quantum phase transition and the low-temperature critical properties of a planar Heisenberg ferromagnet in a transverse field. The phase diagram, the free energy density and the relevant critical exponents in the influence domain of the quantum critical point are obtained for dimensionalities d>2 in the temperature regime where the quantum fluctuations dominate. The d = 2 criticality is also studied decreasing the temperature with the magnetic field fixed at its critical value.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
