Pressure enhancement of the giant magnetocaloric effect in Tb5Si2Ge2 -: art. no. 137201

被引：137

作者：

Morellon, L ^{[1
]}

Arnold, Z

Magen, C

Ritter, C

Prokhnenko, O

Skorokhod, Y

Algarabel, PA

Ibarra, MR

Kamarad, J

机构：

[1] Univ Zaragoza, Dept Fis Mat Condensada, Zaragoza 50009, Spain

[2] Univ Zaragoza, Inst Ciencia Mat Aragon, Zaragoza 50009, Spain

[3] Consejo Super Invest Cientificas, Zaragoza 50009, Spain

[4] Inst Phys AS CR, Prague 18221 8, Czech Republic

[5] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.93.137201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Effects of temperature and pressure on magnetic, elastic, structural, and thermal properties of Tb5Si2Ge2 have been studied by means of macroscopic (thermal expansion and magnetization) and microscopic (neutron powder diffraction) techniques. We present evidence that the high-temperature second-order ferromagnetic transition can be coupled with the low-temperature first-order structural phase change into a single first-order magnetic-crystallographic transformation at and above a tricritical point in the vicinity of 8.6 kbar. This pressure-induced coupling has a remarkable effect on the magnetocaloric effect, transforming Tb5Si2Ge2 from an ordinary into a giant magnetocaloric effect material.

引用

页码：137201 / 1

页数：4

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