Single-crystal magnetic-susceptibility measurements have been made on CaCu(OAc)4·6H2O between 1.5 and 20°K. The present data cannot be fitted to Fisher's linear chain model with J / k = − 1.4°K as had been previously reported for data taken at higher temperatures. However, the Curie–Weiss law with a value of θ = − 0.18°K describes both the present data and the previous results. In addition, the low-temperature results are equally well fitted by the linear chain model with J / k = − 0.095°K.
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McElearney et al. (1971) studied this question.