Theoretical description of the colossal entropic magnetocaloric effect: Application to MnAs

被引：60
作者：
von Ranke, PJ
Gama, S
Coelho, AA
de Campos, A
Carvalho, AMG
Gandra, FCG
de Oliveira, NA
机构：
[1] Univ Estado Rio De Janeiro, Inst Fis, BR-20550013 Rio De Janeiro, Brazil
[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil
来源：
PHYSICAL REVIEW B | 2006年 / 73卷 / 01期
关键词：
D O I：
10.1103/PhysRevB.73.014415
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report on the theoretical investigations into the recently discovered colossal entropy change in MnAs under magnetic-field change in an isothermal process. The phenomenological model takes into account the exchange-Zeeman interactions, magnetoelastic interactions, the external pressure effect, and the magnetic-field dependence of the lattice entropy. The results show the fundamental role of the lattice entropy in the colossal entropy change for the MnAs compound. The best model parameters and their variation with pressure were determined.
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