Open Journal of Applied Sciences

Volume 3, Issue 3 (July 2013)

ISSN Print: 2165-3917   ISSN Online: 2165-3925

Google-based Impact Factor: 0.92  Citations  h5-index & Ranking

Mean-Field Solution of the Mixed Spin-2 and Spin-5/2 Ising Ferrimagnetic System with Different Single-Ion Anisotropies

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DOI: 10.4236/ojapps.2013.33034    3,151 Downloads   5,237 Views  Citations
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ABSTRACT

The mixed spin-2 and spin-5/2 Ising ferrimagnetic system with different anisotropies (DA/z｜J｜) for the spin-2 and (DB/z｜J｜) for the spin-5/2 is studied by the use of the mean-field theory based on the Bogoliubov inequality for the free energy. First, the ground state phase diagram of the system at zero temperature is obtained on the (DA/z｜J｜,DB/z｜J｜) plane. Topologically, different kinds of phase diagrams are achieved by changing the temperature and the values of the single ion anisotropies DA/z｜J｜ and DB/z｜J｜. Besides second-order transition lines, first order phase transition lines terminating at tricritical points, are found. The existence and dependence of a compensation temperature on single-ion anisotropies is also investigated.

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F. Abubrig, "Mean-Field Solution of the Mixed Spin-2 and Spin-5/2 Ising Ferrimagnetic System with Different Single-Ion Anisotropies," Open Journal of Applied Sciences, Vol. 3 No. 3, 2013, pp. 270-277. doi: 10.4236/ojapps.2013.33034.

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