Abstract
We describe the experimental techniques utilized to study the paramagnetic susceptibility of a crystal as a function of the applied field. We give the main results obtained for Gd, Tb, Dy, Ho and Er. The susceptibility varies sinusoidally with the direction of the applied field. The anisotropy of the susceptibility is a function only of the first crystalline field parameter. The measurement of the thermal variation of the anisotropy of the susceptibility thus provides a method for the determination of the thermal variation of the crystalline field parameter. This variation is in agreement with that given by a point charge model, due to the thermal dilatation. The crystalline field parameters obtained are compared to those given by the theory of Kasuya as well as those deduced from the measurement of the low temperature magnetization.
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