Phase diagrams of the spin-2 Ising model in the presence of a quenched diluted crystal field distribution |
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| Authors: | Ali Yigit a and Erhan Albayrak b a ankiri Karatekin University |
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| Institution: | Ali Yigit a) and Erhan Albayrak b) a) ankiri Karatekin University,Department of Physics,ankiri 18100,Turkey b) Erciyes University,Department of Physics,Kayseri 38039,Turkey |
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| Abstract: | We have investigated the random crystal field effects on the phase diagrams of the spin-2 Blume-Capel model for a honeycomb lattice using the effective-field theory with correlations.To do so,the thermal variations of magnetization are studied via calculating the phase diagrams of the model.We have found that the model displays both second-order and first-order phase transitions in addition to the tricritical and isolated points.Reentrant behavior is also observed for some appropriate values of certain system parameters.Besides the usual ground-state phases of the spin-2 model including ±2,±1,and 0,we have also observed the phases ±3/2 and ±1/2,which are unusual for the spin-2 case. |
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| Keywords: | spin-2 model random crystal field effective-field theory isolated critical points andtriciritical points |
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