Charge screening and magnetic anisotropy in metallic rare-earth systems

摘要

The calculation of magnetic anisotropy constants is performed beyond thepoint charge model for a continuous charge density distribution of screeningconduction electrons. An important role of the non-uniform electron density, inparticular, of the Friedel oscillations, in the formation of crystal field isdemonstrated. Such effects can modify strongly the effective ion (impurity)charge and even change its sign. This enables one to justify the anion model,which is often used at discussing experimental data on hydrogen-containingsystems. Possible applications to the pure rare-earth metals and RCo5 compoundsare discussed. The deformation of magnetic structure near the interstitialpositive muon owing to the strong local anisotropy, and the correspondingcontribution to the dipole field at the muon are considered.