首页|Villain transformation for XXZ anisotropic ferrimagnetic spin chain
Villain transformation for XXZ anisotropic ferrimagnetic spin chain
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NSTL
Elsevier
We investigate the spin excitation spectrum and the thermodynamic properties of the XXZ anisotropic ferrimagnetic spin-(1/2, 1) chain under the presence of a magnetic field using the Villain transformation method. The effect of the XXZ anisotropic parameter and external magnetic field on the thermodynamic observables are calculated at finite temperature. The energ y spectra exhibit the coexistence of a gapless branch and a gapf u l branch, both of them are sensitive to the change of XXZ anisotropic parameter. The gapless branch exhibits a V-shape structure, while the gapf u l branch is reversed and presents an omega-shape for the XY model which is completely different from previous results for the XXZ model. Thermodynamic quantities such as free energy, internal energy, entropy, specific heat and magnetization are present. These findings for the isotropic case are compared with the results calculated by the other established methods and it turns out that Villain transformation we l l describes this system at low temperature.
Thermodynamic propertiesAnisotropic ferrimagetic spin chainVillain transformationMagnetic fieldMEAN-FIELD THEORY
NSTL
Elsevier
