PHASE-TRANSITIONS AND SPIN DYNAMICS IN HEXAGONAL ABX3 TYPE ANTIFERROMAGNETS

被引：11
作者：
TANAKA, H
机构：
[1] Department of Physics, College of General Education, Nagoya University, Chikusa-ku, Nagoya, 464-01, Furo-cho
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1990年 / 90-1卷
关键词：
D O I：
10.1016/S0304-8853(10)80088-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have measured ESR spectra of CsNiBr3, RbNiBr3 and CsMnI3 in order to investigate the spin dynamics related to the successive phase transitions. The resonance field of the omega-1-mode, whose resonance condition at T = 0 K is given by omega/gamma = H for H perpendicular-to c, shifts toward the high-field side with increasing temperature and shows a tendency to diverge at the lower transition point T(N2). This fact seems to indicate that the local rotational fluctuations of the triangular spin structure around the c-axis are enhanced as temperature is increased and at T(N2) the distribution of the directions of the local triangular structure becomes isotropic with respect to the c-axis.
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页码：251 / 254
页数：4
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