Thermodynamics properties of an anisotropic Ising antiferromagnet in both external longitudinal and transverse fields

We have studied the anisotropic two-dimensional nearest-neighbor Ising model with competitive interactions in both uniform longitudinal field H and transverse magnetic field Ω. Using the effective-field theory (EFT) with correlation in cluster with N=1 spin we calculate the thermodynamic properties...

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Bibliographic Details
Published in:Physica A 2013-11, Vol.392 (21), p.5313-5321
Main Authors: do Nascimento, Denise A., Neto, Minos A., de Sousa, J. Ricardo, Pacobahyba, J.T.M.
Format: Article
Language:English
Subjects:
Anisotropy
Antiferromagnetism
Clusters
Effective-field theory
Ferromagnetism
Ising model
Magnetic fields
Mathematical models
Quantum phase transition
Thermodynamic properties
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Summary:We have studied the anisotropic two-dimensional nearest-neighbor Ising model with competitive interactions in both uniform longitudinal field H and transverse magnetic field Ω. Using the effective-field theory (EFT) with correlation in cluster with N=1 spin we calculate the thermodynamic properties as a function of temperature with values H and Ω fixed. The model consists of ferromagnetic interaction Jx in the x direction and antiferromagnetic interaction Jy in the y direction, and it is found that for H/Jy∈[0,2] the system exhibits a second-order phase transition. The thermodynamic properties are obtained for the particular case of λ=Jx/Jy=1 (isotropic square lattice). •Ising antiferromagnet in the transverse magnetic field.•We use effective-field theory.•We have obtained thermodynamics properties at finite temperature.
ISSN:0378-4371
1873-2119
DOI:10.1016/j.physa.2013.06.064