In:
Acta Physica Sinica, Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences, Vol. 32, No. 1 ( 1983), p. 33-
Kurzfassung:
Based on s-d interaction, we consider RKKY interaction existing between two magnetic impurities, and propose a new double impurities scattering model. According to this model, when an impurity spin makes spin flip scattering, its spin as an inner free degree will be confined by other impurities' spin, where the RKKY correlation exists between them. Because of this correlation, it will suppress its spin flip scattering. This suppression, coupled with the Kondo logT term, causes a local maximum. In this paper we have calculated all possible "DIS" diagrams (the double impurities self-energy diagrams) and found a term A/(T02-T2) contribute to the Kondo resistance, where A is a positive constant, T0 is some critical temperature. When T≤T0, this formula is meaningless. This theory is essentially different from the previous molecular field theory. Because it does not depend on the magnetic order in alloys, so, when T≥Tc (Tc is magnetic phase transion temperature), this mechanism still works but the molecular field theory does not. This mechanism is a paramagnetic effect. We have compared this theory with experimental curves of Cd-Mn (its impurity density is 0.1～0.01 at.%). We find that the agreement with experiments is good. Finally, we consider that this mechanism is the main reason to quench the Kondo log T divergence even for very dilute magnetic alloys in low temperature.
Materialart:
Online-Ressource
ISSN:
1000-3290
,
1000-3290
Sprache:
Unbekannt
Verlag:
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Publikationsdatum:
1983
