Open AccessTHE DOUBLE IMPURITIES SCATTERING THEORY FOR "THE RESISTANCE MAXIMUM" PHENOMENA IN THE DILUTE MAGNETIC ALLOYS
Author(s) -
Wang Zhong-chen,
Liu Fu-Sui
Publication year - 1983
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.32.33
Subject(s) - condensed matter physics , impurity , anderson impurity model , spin (aerodynamics) , scattering , kondo effect , rkky interaction , magnetic impurity , physics , paramagnetism , magnetic field , neutron scattering , mean field theory , phase (matter) , materials science , quantum mechanics , antiferromagnetism , thermodynamics
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 0.10.01 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.