POSITRON-ANNIHILATION STUDY OF THE HALF-METALLIC FERROMAGNET NIMNSB - EXPERIMENT

被引：177

作者：

HANSSEN, KEHM ^{[1
]}

MIJNARENDS, PE ^{[1
]}

RABOU, LPLM ^{[1
]}

BUSCHOW, KHJ ^{[1
]}

机构：

[1] NETHERLANDS ENERGY RES FDN,1755 ZG PETTEN,NETHERLANDS

来源：

PHYSICAL REVIEW B | 1990年 / 42卷 / 03期

关键词：

D O I：

10.1103/PhysRevB.42.1533

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Spin-polarized measurements of the two-dimensional angular correlation of annihilation radiation in NiMnSb are presented. By making use of the inherent partial polarization of the positron beam and the alignment of the magnetic domains with the aid of an external magnetic field, the sum and difference of the spin-dependent contributions to the angular correlation have been obtained for integration directions 100, 110, and 111. The results are compared with calculated distributions. A least-squares analysis of the data yields a value of (-8.4±0.1)×10-3 for the three-photon difference effect in NiMnSb and establishes the half-metallic character of the band structure with an accuracy of -0.02+0.01 electrons per formula unit. © 1990 The American Physical Society.

引用

页码：1533 / 1540

页数：8

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