Structural and Magnetic Phase Transitions in RbVBr_3
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概要
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Structural and magnetic phase transitions in RbVBr_3 have been investigated by neutron scattering. A structural phase transition occurs at T_t= 89.6K. The unit cell below T_t is described by enlarging that of CsNiCl_3 to √<3>a, √<3>a, c. The intensity of the nuclear Bragg peak for Q=(1/3, 1/3, 2) varies continuously at T_t, implying that the transition is of the second kind or very close to it. RbVBr_3 undergoes two magnetic phase transitions at T_<N1>=28.1K and T_<N2>=21.0K due to the inequality of the interchain exchange couplings which arises from the structural phase transition. The critical exponent of the sublattice magnetizations for T_<N1> is found to be β_1=0.32±0.01 which is a little smaller than the exponent of the three dimensional XY universality. The intensity of the magnetic (1, 1, 1) reflection which is very weak in the intermediate phase grows steeply below T_<N2>. This indicates that the partially disordered collinear structure is acquired in the intermediate phase.
- 社団法人日本物理学会の論文
- 1994-09-15
著者
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TANAKA Hidekazu
Department of Natural History Sciences, Faculty of Science, Hokkaido University
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KAKURAI Kazuhisa
Institute for Solid State Physics,The University of Tokyo
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Kakurai Kazuhisa
Institute For Solid State Physics University Of Tokyo
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Tanaka Hidekazu
Department Of Internal Medicine Iii Osaka Medical College
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Tanaka Hidekazu
Department Of Earth And Planetary Sciences Faculty Of Science Tokyo Institute Of Technology
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Tanaka Hidekazu
Department Of Chemistry And Chemical Biology Gunma University
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