Study of Short-Range Spin Ordering in RbNi_<1-x>Co_xCl_3
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概要
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Short-range spin ordering of RbNi_<1-x>Co_xCl_3 with the substitutional concentration x smaller than 0.05 was studied by the birefringence technique. This mixed system belongs to an Ising-like Heisenberg antiferromagnet on a triangular lattice and has successive phase transitions. The upper Neel temperature, T_<N1>, goes up and the lower one, T_<N2>, goes down as an effective Ising anisotropy is amplified with gradual substituting of Ni^<2+> by Co^<2+>. The temperature dependence of the birefringence Δ n^<ac> for light propagating perpendicular to the c-axis is sensitive to the Co^<2+> concentration x at temperatures near the phase transition points. How the Ising anisotropy affects the short-range ordering of an Ising-like Heisenberg antiferromagnet on a triangular lattice is discussed by analyzing the temperature dependence of the observed birefringence.
- 社団法人日本物理学会の論文
- 1994-12-15
著者
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Oohara Yasuaki
Department Of Physics Faculty Of Science Tokyo Institute Of Technology
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Iio Katsunori
Department Of Physics (cond. Mat. Phys.) Graduate School Of Science And Engineering Tokyo Institute
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