Specific heat, electric susceptibility and thermal conductivity of praseodymium ethyl sulphate: A one-dimensional electric dipolar XY system

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Abstract
Specific heat and electric susceptibility measurements on praseodymium ethyl sulphate have shown that down to 0.06K it is well described by the one-dimensional XY model with the interaction between nearest neighbour pairs of praseodymium ions arising from electric dipole-dipole coupling. A comparison of the experimental data and the theoretical expression for electric susceptibility gives the nearest neighbour pair interaction parameter, J, equal to kB*0.76K. The electric dipole moment of the Pr3+ ion was found to be confined to the XY plane and was of magnitude gamma =7.8*10-31 C m; the consequent electric dipole-dipole interaction parameter between nearest neighbours was kB*1.12K, in reasonably good agreement with the J-value determined from electric susceptibility.