Magnetostriction of Rare Earth Impurities in YCu2Si2
Measurements of the magnetostriction (MS) of dilute Rare Earth (RE) ions in various metallic matrices at low temperatures and high fields [1–7] have established that a nearly volume conserving lattice distortion exists around each individual RE ion in the magnetically saturated state which amounts to 10−3 to 10−2 per unit cell. The distortion depends very little on concentration but very strongly on the RE species in a given matrix. Although the distortion behaves very much like a single ion effect, it cannot be regarded as a universal property of a given RE species or compared to the magnetic moment. This follows from its dependence on the matrix for a given RE ion and also from the fact that the correlation between the observed distortion and the so called Stevens factor across the series of RE is sometimes weak or non existent. In order to better understand the origin of the distortion it seems therefore necessary to study it in many different matrices. In this paper we report the first systematic study of the RE single ion MS in a non cubic metallic environment, namely in YCu2Si2 which has the tetragonal ThCr2Si2 structure.
KeywordsRare Earth Metallic Matrice Rare Earth Impurity High Temperature Phase Transition Metallic Environment
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