Magnetocaloric effect in spin-1/2 XX chains with three-spin interactions

被引：37
作者：
Topilko, M. [1 ]
Krokhmalskii, T. [1 ,2 ]
Derzhko, O. [1 ,2 ]
Ohanyan, V. [3 ]
机构：
[1] Natl Acad Sci Ukraine, Inst Condensed Matter Phys, UA-79011 Lvov 11, Ukraine
[2] Ivan Franko Natl Univ Lviv, Dept Theoret Phys, UA-79005 Lvov 5, Ukraine
[3] Yerevan State Univ, Dept Theoret Phys, Yerevan 0025, Armenia
来源：
EUROPEAN PHYSICAL JOURNAL B | 2012年 / 85卷 / 08期
关键词：
QUANTUM PHASE-TRANSITIONS; XY-MODEL; ISING MODEL; ANTIFERROMAGNETS; FIELD;
D O I：
10.1140/epjb/e2012-30359-8
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We consider the exactly solvable spin-1/2 XX chain with the three-spin interactions of the XZX + Y ZY and XZY-YZX types in an external (transverse) magnetic field. We calculate the entropy and examine the magnetocaloric effect for the quantum spin system. We discuss a relation between the cooling/heating efficiency and the ground-state phase diagram of the quantum spin model. We also compare ability to cool/heat in the vicinity of the quantum critical and triple points. Moreover, we examine the magnetocaloric effect for the spin-1/2 XX chain with three-spin interactions in a random (Lorentzian) transverse magnetic field.
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页数：9
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