Massive magnetic-field-induced structural transformation in Gd5Ge4 and the nature of the giant magnetocaloric effect -: art. no. 197204

被引：260

作者：

Pecharsky, VK ^{[1
]}

Holm, AP

Gschneidner, KA

Rink, R

机构：

[1] Ames Lab, Mat & Engn Phys Program, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.91.197204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A massive magnetic-field-induced structural transformation in Gd5Ge4, which occurs below 30 K, was imaged at the atomic level by uniquely coupling high-resolution x-ray powder diffraction with magnetic fields up to 35 kOe. In addition to uncovering the nature of the magnetic field induced structural transition, our data demonstrate that the giant magnetocaloric effect, observed in low magnetic fields, arises from the amplification of a conventional magnetic entropy-driven mechanism by the difference in the entropies of two phases, borne by the concomitant structural transformation.

引用

页数：4

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