Zahra Feiznejad, Saeed Mahdavifar,
Volume 14, Issue 1 (4-2014)
Abstract
The spin-1/2 Ising chain in presence of a magnetic field and the Dzyaloshinskii-Moriya interaction is considered. First, using the rotation operator the model is transformed to the anisotropic spin-1/2 XXZ model in presence of a longitudinal magnetic field and then, using the fermionization technique and mean field approximation, the diagonalized Hamiltonian is obtained. The thermodynamic behavior of the specific heat is studied. It is found that the maximum value of the specific heat shows dual behavior. Specially, in the region of fields less than quantum critical field, it decreases by increasing field but behaves inversely in the region of the magnetic fields more than the quantum critical field. In addition, the magnetization process is studied and it is shown that the Dzyaloshinskii-Moriya interaction influences the magnetization process.
