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;
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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11588/8986
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