Open AccessA MECHANISM OF RESISTIVITY MINIMA IN Au1-x Nix ALLOYS (x = 0.30-0.42)
Author(s) -
Mei Yu,
Liu Fu-Sui,
Hongyun Luo
Publication year - 1986
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.35.33
Subject(s) - electrical resistivity and conductivity , condensed matter physics , ferromagnetism , materials science , rkky interaction , scattering , alloy , cluster (spacecraft) , spin (aerodynamics) , paramagnetism , kondo effect , physics , thermodynamics , metallurgy , quantum mechanics , computer science , optics , programming language
In order to explain the experimental results of resistivity minima in Au1-xNix alloys (x=0.30-0.42) at low temperature, we propose a model of the alloy with dilute spin clusters in the paramagnetic state based on the s-d interaction. The resistivity contribution from the electron scattering by isolate spin clusters and by spin clusters with a ferromagnetic RKKY interaction are considered. Combining with the phonon contribution, derived from the experimental data of ρi(T) of Au-Cu or Au80Ni20 alloy, we obtain a resistivity minimum. The calculated total resistivity ρ(T) is in good agreement with the experimental result. It is shown that a decrease in ρ with increasing temperature below Tmin is mainly attributed to the Kondo effect caused by isolate spin clusters. The electron scattering from coupled spin cluster pairs gives a much smaller contribution to the resistivity, which exhibits a T-1 temperature-dependence and decreases rapidly with increasing temperature. So the experimental relults of ρ(T)-ρi(T) in Au1-xNix alloys (x=0.30-0.42) show a log T temperature-dependence over a wide tempera-ture range.