Low-temperature magnetic characteristics of tetrahedral CoCl42−. III. Magnetic exchange in paramagnetic Cs2CoCl4

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Abstract
The results of low‐temperature studies of the magnetic characteristics of Cs2CoCl4 are reported. Single‐crystal principal‐axes magnetic susceptibility measurements between 1.5 and 20 K have been fit to an exchange‐modified spin‐3/2 single‐ion model. Heat capacity measurements between 1 and 30 K on Cs2CoCl4 and between 4 and 25 K on Cs2ZnCl4 have been used with a corresponding states procedure to obtain the magnetic heat capacity of Cs2CoCl4. All the results generally indicate a large zero‐field splitting of 14 to 16 K with the possibility of a rhombic distortion of the CoCl42− ion. Both the susceptibility and heat capacity measurements indicate the presence of significant magnetic exchange. At the lower temperatures the heat capacity results appear to be describable by an XY linear chain model, in agreement with structural considerations in conjunction with the theoretically expected behavior of tetrahedral cobalt(II).