ANTIFERROMAGNETISM OF GAMMA FEOOH - A MOSSBAUER EFFECT STUDY

被引:88
作者
JOHNSON, CE
机构
[1] Materials Physics Division, Atomic Energy Research Establishment, Harwell, Berks
来源
JOURNAL OF PHYSICS PART C SOLID STATE PHYSICS | 1969年 / 2卷 / 11期
关键词
D O I
10.1088/0022-3719/2/11/314
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Measurements of the Mössbauer spectra of γ FeOOH show that it is an antiferromagnet with a Néel temperature of 73°K. The hyperfine field at the 57Fe nuclei is 460±5 kG. By applying an external magnetic field to a single crystal the Fe3+ magnetic moments are shown to be collinear in the antiferromagnetic state, with the alignment along the c axis. From measurements in the paramagnetic state using polarized γ radiation the electric field gradient is shown to be negative in sign, and its major axis lies in the ac plane making an angle of about 55°with the c axis.
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页码:1996 / &
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