MN MOMENT INSTABILITY IN THE TBMN2 INTERMETALLIC COMPOUND

被引:58
作者
BROWN, PJ
OULADDIAF, B
BALLOU, R
DEPORTES, J
MARKOSYAN, AS
机构
[1] MV LOMONOSOV STATE UNIV,DEPT PHYS,MOSCOW 119899,USSR
[2] CNRS,LAB L NEEL,F-38042 GRENOBLE,FRANCE
关键词
D O I
10.1088/0953-8984/4/4/020
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Neutron diffraction experiments have been performed on a TbMn2 single crystal and on Tb(Mn0.96Fe0.04)2 powder samples. The magnetic structure of TbMn2 is metastable poised between two structures, S1 with propagation vector [2/3 2/3 0] and S2 with propaption vector [1/2 1/2 1/2]. A transition from S1 to S2 can be induced either by an applied field of 4.5 T at 25 K or by chemical pressure induced by substitution of Mn by Fe. The S2 structure has been studied in Tb(Mn0.96Fe0.04)2. The transition to this structure is accompanied by a huge rhombohedral distortion and the structure itself is notable for the coexistence of magnetic and non-magnetic manganese atoms. This peculiar feature is attributed to instability of the Mn moment combined with frustration of the Mn itinerant antiferromagnetism.
引用
收藏
页码:1103 / 1113
页数:11
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