Pressure-induced colossal magnetocaloric effect in MnAs

被引：295
作者：
Gama, S
Coelho, AA
de Campos, A
Carvalho, AMG
Gandra, FCG
von Ranke, PJ
de Oliveira, NA
机构：
[1] Univ Estadual Campinas, UNICAMP, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil
[2] Univ Estado Rio de Janeiro, Inst Fis, BR-20550013 Rio De Janeiro, Brazil
来源：
PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 23期
基金：
巴西圣保罗研究基金会;
关键词：
D O I：
10.1103/PhysRevLett.93.237202
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
To present day, the maximum magnetocaloric effect (MCE) at room temperature for a magnetic field change of 5 T is 40 J/(kg K) for MnAs. In this Letter we present colossal MCE measurements on MnAs under pressure, reaching values up to 267 J/(kg K), far greater than the magnetic limit arising from the assumption of magnetic field independence of the lattice and electronic entropy contributions. The origin of the effect is the contribution to the entropy variation coming from the lattice through the magnetoelastic coupling.
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页数：4
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