Critical properties of mixed spin-1 and spin-5/2 with equal and unequal crystal fields  

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2期202-209,共8页中国物理B（英文版）

基　　金：supported by Scientific Research Found of Karatekin University (Grant No.2011/10)

摘　　要：The effects of assuming equal or unequal crystal fields （CF） on the phase diagrams of a mixed spin-1 and spin-5/2 system are investigated in terms of the recursion relations on the Bethe lattice （BL）. The equal CF case was considered for the coordination numbers q = 3,4, and 6, while for q = 3 the unequal CF case was also studied. It was found that for the equal CF case, the model exhibits second-order phase transitions and two compensation temperatures for all q, the reentrant behavior for q = 4 and first-order phase transitions and tricritical point （TCP） for q = 6. In the unequal CF case for q = 3, the system yields first- and second-order phase transitions, TCP＇s, and three compensation temperatures. In addition, the TCP＇s in a very short range are classified as the stable and unstable ones depending on their free energies.The effects of assuming equal or unequal crystal fields （CF） on the phase diagrams of a mixed spin-1 and spin-5/2 system are investigated in terms of the recursion relations on the Bethe lattice （BL）. The equal CF case was considered for the coordination numbers q = 3,4, and 6, while for q = 3 the unequal CF case was also studied. It was found that for the equal CF case, the model exhibits second-order phase transitions and two compensation temperatures for all q, the reentrant behavior for q = 4 and first-order phase transitions and tricritical point （TCP） for q = 6. In the unequal CF case for q = 3, the system yields first- and second-order phase transitions, TCP＇s, and three compensation temperatures. In addition, the TCP＇s in a very short range are classified as the stable and unstable ones depending on their free energies.

关 键 词：mixed spin Bethe lattice COMPENSATION FERRIMAGNET 

分 类 号：O411.3[理学—理论物理]