Phase diagrams of the spin-2 Ising model in the presence of a quenched diluted crystal field distribution  

作　　者：Ali Yigit Erhan Albayrak 

机构地区：[1]ankiri Karatekin University,Department of Physics [2]Erciyes University,Department of Physics

出　　处：《Chinese Physics B》2012年第11期114-120,共7页中国物理B（英文版）

摘　　要：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.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.

关 键 词：spin-2 model random crystal field effective-field theory isolated critical points andtriciritical points 

分 类 号：O73[理学—晶体学]