NEUTRON-DIFFRACTION STUDIES OF CAMN2GE2 AND BAMN2GE2 COMPOUNDS - 1ST EXAMPLES OF ANTIFERROMAGNETIC MN PLANES IN THCR2SI2-TYPE STRUCTURE COMPOUNDS

被引：39

作者：

MALAMAN, B ^{[1
]}

VENTURINI, G ^{[1
]}

WELTER, R ^{[1
]}

RESSOUCHE, E ^{[1
]}

机构：

[1] CEA,DEPT RECH FONDAMENTALE MAT CONDENSEE,SPSMS,MDN,F-38054 GRENOBLE 9,FRANCE

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1994年 / 210卷 / 1-2期

关键词：

D O I：

10.1016/0925-8388(94)90140-6

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The magnetic properties of ThCr2Si2-type structure CaMn2Ge2 and BaMn2Ge2 compounds have been investigated by neutron diffraction experiments. In the whole temperature range studied (2-270 K), both compounds are purely collinear antiferromagnets (not detected by bulk magnetometric measurements) characterized by a stacking of antiferromagnetic (001) Mn planes. This peculiar Mn-sublattice magnetic behaviour seems to be related to the valency of the large metal. At 2 K, the total Mn moments are about 2.7 mu(B) and 3.6 mu(B) for CaMn2Ge2 and BaMn2Ge2, respectively. The results are compared with those of closely related RMnSi and RMnGe compounds and the isotypic alkali-metal manganese pnictides. The magnetic properties of the ThCr2Si2-type structure RMn2X2 (X-Si, Ge) compounds are discussed.

引用

页码：209 / 212

页数：4

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