Magnetic structure of the ternary germanide Ce3Ni2Ge7

被引：21

作者：

Durivault, L

Bourée, F

Chevalier, B

André, G

Etourneau, J

Isnard, O

机构：

[1] Univ Bordeaux 1, Ist Chim Mat Condensee, ICMCB, CNRS,UPR 9048, F-33608 Pessac, France

[2] CEA Saclay, Leon Brillouin Lab, CNRS, F-91191 Gif Sur Yvette, France

[3] CNRS, Cristallog Lab, F-38042 Grenoble, France

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2001年 / 232卷 / 03期

关键词：

ternary germanide; antiferromagnet; intermediate valence; magnetic structure;

D O I：

10.1016/S0304-8853(01)00189-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The ternary germanide Ce3Ni2Ce7 has been studied by means of neutron powder diffraction and Ce L-III X-ray absorption (XAS). This compound which orders antiferrormagnetically below T-N = 7.2(2)K, crystallizes in the orthorhombic (Cmmm space group) La3Co2Sn7-type structure where Ce atoms occupying two inequivalent crystallographic sites: Ce1 at 2d site and Ce2 at 4i site. Below T-N, the antiferromagnetic structure of Ce3Ni2Ge7 is collinear but only the Ce2 atoms carry a magnetic moment (1.98(2)mu (B) at 1.4K). The absence of ordered magnetic moment on Cel atoms can be correlated to the average valence nu = 3.03(1), determined by X-ray absorption spectroscopy, suggesting an intermediate valence state of cerium in the 2d site. (C) 2001 Elsevier Science B.V. All rights reserved.

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页码：139 / 146

页数：8

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