STRONG MN-MN DISTANCE DEPENDENCE OF THE MN INTERLAYER COUPLING IN SMMN2GE2-RELATED COMPOUNDS AND ITS ROLE IN MAGNETIC PHASE-TRANSITIONS

被引：95

作者：

BRABERS, JHVJ ^{[1
]}

NOLTEN, AJ ^{[1
]}

KAYZEL, F ^{[1
]}

LENCZOWSKI, SHJ ^{[1
]}

BUSCHOW, KHJ ^{[1
]}

DEBOER, FR ^{[1
]}

机构：

[1] PHILIPS RES LABS,5600 JA EINDHOVEN,NETHERLANDS

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.50.16410

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The interplay between the Mn interlayer coupling constant nMn-Mn and the thermal expansion has been investigated by means of thermal-expansion, specific-heat, and magnetization measurements. A linear relation between nMn-Mn and the thermal expansion was established. This linear relation is used in the formulation of a quantitative model for temperature-induced metamagnetic transitions in RMn2Ge2 compounds. The observed relation between the unit-cell dimensions and the transition temperatures is interpreted in terms of this model. For polycrystalline Sm0.9Y0.1Mn2Ge2, the relation between the metamagnetic transitions and anomalies in the electrical resistivity was investigated. A magnetic-field-induced change of the resistance of 10% was observed at 185 K. It appears likely that magnetovolume effects are responsible for the anomalous resistance behavior. © 1994 The American Physical Society.

引用

页码：16410 / 16417

页数：8

共 11 条

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