Premartensitic transition driven by magnetoelastic interaction in bcc ferromagnetic Ni2MnGa

被引：197

作者：

Planes, A

Obrado, E

GonzalezComas, A

Manosa, L

机构：

[1] Departament d’Estructura i Constituents de la Matèria, Facultat de Física, Universitat de Barcelona, Barcelona, 08028

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.79.3926

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We show that the magnetoelastic coupling between the magnetization and the amplitude of a short wavelength phonon enables the existence of a first order premartensitic transition from a bce to a micromodulated phase in Ni2MnGa. Such a magnetoelastic coupling has been experimentally evidenced by ac susceptibility and ultrasonic measurements under an applied magnetic field. A latent heat around 9 J/mol has been measured using a highly sensitive calorimeter. This value is in very good agreement with the value predicted by a proposed model.

引用

页码：3926 / 3929

页数：4

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