Self Polarization Fields of Rare Earth Impurities in S-p Hosts: A Theoretical Study

摘要

A model consisting of an Anderson-Moriya d-resonance, strongly perturbed by a Slater-Koster potential acting in the conduction band, is developed to describe dilute rare earth impurities in s-p hosts. The properties of this model are studied, in particular, the deviations from the usual behavior of the phase shifts due to the Slater-Koster potential. The local magnetic responses to the rare earth's exchange fields are calculated in order to discuss self-polarization hyperfine fields of the rare earth in these hosts. The behavior of the hyperfine fields in terms of the parameters of the model is discussed numerically, and possible changes in sign along the s-p series are obtained. It is suggested that the combination of an Anderson-Moriya resonance and the strong Slater-Koster scattering may be a physical mechanism suitable to induce changes in sign of the hyperfine field in these systems. Experiments are suggested to test the model. (Atomindex citation 10:439068)