Thermal Expansion and Magnetostriction of Mg Single Crystals with Heavy Rare-Earth Impurities
The large magnetostriction of rare earth materials is due to the orbital moment of the 4f electrons, which can result in an aspherical charge distribution, coupled to J, and hence to the magnetic moments on the rare earth ions. Nicholson et al.1 have shown that this single-ion mechanism makes the most important contribution to the magnetostriction by establishing that in LaPd3-based dilute quasibinary alloys the magnetostriction per rare earth ion is comparable in magnitude to what is observed in rare earth metals and compounds. Their results could be understood in terms of the alignment of quadrupole moments, representing the lowest order aspherical component of the 4f charge distribution. More recently Campbell et al.2 have measured the magnetostriction in dilute silver-rare earth mono and poly crystals. Their results could not be explained by quadrupole moment orientation only, but they suggested that also ion-lattice interactions of higher order than quadrupole and the effects of the local magnetostriction energy should be taken into account.
KeywordsRare Earth Crystal Field Quadrupole Moment Shape Effect Heavy Rare Earth
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- 3.M. de Jong, P.Touborg and J.Bijvoet, Magnetic susceptibility of dilute alloys of rare earths in magnesium, J. de Phys. 40 (1979) C5 – 17.Google Scholar
- 4.M.H. de Jong, H.Hölscher, P.F. de Chatel and J.Bijvoet, Macroscopic shape effect due to quadrupole orientation in single crystals of Mg with heavy RE impurities,Proceedings I.C.M. Munich 1979, to be published in J. of Magn. and Magn.Mat.Google Scholar