Abstract
The magnetic susceptibility of single crystal of Ni(NH 3 ) 2 ·Ni(CN) 4 ·2C 6 H 6 has been measured in liquid hydrogen and liquid helium temperature regions. The Neel temperature was found to be 2.37°K from the experimental results of proton resonance and specific heat measurements. The uniaxial anisotropy constant and the molecular field constant which are obtained from the present research, are respectively D / k =3.6°K and A / k =4.5°K and they are the same order of magnitude. The values of perpendicular susceptibility and spin-flopping field in antiferromagnetic state are well described using the values of uniaxial anisotropy constant and exchange interaction constant obtained in the molecular field approximation. The temperature dependence of parallel susceptibility χ // in antiferromagnetic state is in good agreement with the theoretical result calculated by the spin wave method, over the temperature range 0∼2.2°K. The preferred direction of sublattice magnetization is the c -axis of this crystal.
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