Effects of Crystalline Fields on the Physical Properties of PrB4
Most of the rare earths form tetraborides whose structure is of ThB4 type. The rare earth ions are in a 3+ state except Ce and Yb.1 It is interesting that among the metallic rare earth tetraborides which show magnetic ordering, PrB4 is the only ferromagnet.2 Furthermore, strong magnetic anisotropy has been observed.3 In order to investigate the origin of the magnetic anisotropy, we have measured magnetization curves for PrB4 in magnetic fields up to 85 kOe. Using the crystalline field calculated on the basis of the point charge model, we have tried for the first time to analyze the magnetic anisotropy and the temperature dependent spin-disorder resistivity of PrB4. The purpose of the present paper is to report and discuss the results of these observations.
KeywordsRare Earth Magnetic Anisotropy Rare Earth Metal Powdered Boron Point Charge Model
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