Quantum criticality of a planar Heisenberg ferromagnet in a transverse magnetic field

Caramico D’Auria, A., L. De Cesare, M.T. Mercaldo and I. Rabuffo

Physica A: Statistical Mechanics and its Applications, 2005, vol. 351, issue 2, 294-314

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. The method of calculation and the peculiarity of the model allow us to work systematically within the region around the critical line where the quantum degrees of freedom govern the low-temperature critical behavior of the model.

Keywords: Quantum criticality; Planar Heisenberg ferromagnet (search for similar items in EconPapers)
Date: 2005
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:351:y:2005:i:2:p:294-314

DOI: 10.1016/j.physa.2004.12.053

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