Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8156441 | Journal of Magnetism and Magnetic Materials | 2015 | 5 Pages |
Abstract
The magnetic and thermodynamic properties such as the magnetization, internal energy, specific heat and susceptibility of spin-2 Heisenberg ferromagnetic system on a square lattice are studied by using Green׳s function technique. Without including the next nearest neighbor interaction, one doesn׳t observe the second-order phase transitions. We found that only when the next nearest neighbor interaction is greater than the nearest neighbor interaction, the second-order phase transitions exist for the small single-ion anisotropy values. Indeed, in the case of negative anisotropy which corresponds to first-order phase transitions, the energies have discontinuities. At the same time, the specific heat shows two peaks.
Related Topics
Physical Sciences and Engineering
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Condensed Matter Physics
Authors
Gülistan Mert,