Abstract
Short-range spin ordering of RbNi 1- x Co x Cl 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 a c 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.
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