RARE-EARTH TRANSITION-METAL INTERMETALLICS

被引:94
作者
BROOKS, MSS [1 ]
NORDSTROM, L [1 ]
JOHANSSON, B [1 ]
机构
[1] UNIV UPPSALA, INST PHYS, CONDENSED MATTER THEORY GRP, S-75121 UPPSALA, SWEDEN
关键词
D O I
10.1016/0921-4526(91)90421-A
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The combination of itinerant transition metal (M = Fe) and localized rare-earth (R = Gd-Y) magnetism in RFe2 compounds has been investigated in self-consistent energy band calculations. The computed and measured total moments are in good agreement for all cases where single crystal data are available. We find, however, that there is a significant contribution to the moment from the R-5d partial moments coupled antiparallel to the Fe-3d moment which results from 3d-5d hybridization. The R-4f moments interact with the conduction band system solely by local exchange interactions, which are calculated ab initio from density functional theory. A sum rule for the total 3d + 5d moment is shown to be obeyed and the effective ferrimagnetic exchange interaction between rare-earth and transition-metal moments is discussed. Finally, the spin wave spectra of these materials are evaluated in terms of a model arising from these calculations.
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页码:95 / 100
页数:6
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