Investigations of the solid solution NdMn2-xFexGe2 (x=0.1-1.4) by magnetic measurements and neutron diffraction

被引:51
作者
Venturini, G [1 ]
Malaman, B [1 ]
Ressouche, E [1 ]
机构
[1] CEA,DEPT RECH FONDAMENTALE MAT CONDENSEE,SPSMS MDN,F-38054 GRENOBLE 9,FRANCE
关键词
rare earth; iron germanides; manganese germanides; solid solutions; magnetic measurements; neutron diffraction;
D O I
10.1016/0925-8388(95)02177-9
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 solid solution NdMn2-xFexGe2 (x < 1.4) was studied by means of X-ray powder diffraction, magnetic measurements and neutron diffraction study. A typical SmMn2Ge2-like behaviour is observed for x=0.425. The magnetic structures of NdMn1-6Fe0.4Ge2, NdMn1.4Fe0.6Ge2 and NdMn1.1Fe0.9Ge2 have been determined between 2 and 300 K. The results lead to the construction of a partial x-T magnetic phase diagram. Results of both NdMn2-xFexGe2 and LaMn2-xFexGe2 solid solutions are compared, and the effects of Mn substitution on the in-plane magnetic couplings are discussed. The effects of iron substitution on the interplane magnetic couplings are examined. A slight increase of the critical d(Mn-Mn) distance is observed. In NdMn1.1Fe0.9Ge2, the onset of antiferromagnetism seems to be correlated to a large decrease of the Ge-Ge separation.
引用
收藏
页码:61 / 73
页数:13
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