Strong Crystal Field Effects in TmNi5
This work on TmNi5 is part of a wider study devoted to the quantitative determination of the rare earth 4f and nickel 3d magnetism in the hexagonal compounds RNi5 OR = rare earth) (1–3). Because of the filling of the 3d band due to transfer of 4d electrons contributed by the rare earth the Stoner criterion of the onset of ferromagnetism is not satisfied for the Ni atoms,which thus exhibit only an exchange enhanced Pauli paramagnetism (4). Thus the main contribution to the magnetism of the RNi5 compounds originates from the rare earth on which the crystal field effect (CEF) plays a preponderant role (if L ≠ 0). In TmNi5 the sign and the value expected for the second-order term of the CEF should lead to a huge uniaxial anisotropy. In that case it is worth studying the effect of such anisotropy on the Curie temperature.
KeywordsRare Earth Thermal Variation Elastic Peak Neutron Spectroscopy Crystal Field Effect
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