| Autor: |
Rapp, Ö., Grindborg, J. E., Rao, K. V. |
| Zdroj: |
Journal of Low Temperature Physics; April 1979, Vol. 35 Issue: 1-2 p89-102, 14p |
| Abstrakt: |
We present a systematic study, to very low temperatures (<20 mK), of the electrical resistance of an amorphous metallic system, (Fe1-xNix)75P16B6Al3, with x varying from 0 to 1, so as to go from a magnetic to a nonmagnetic state. In all the alloys studied a minimum in the temperature range 8–40 K is observed. The resistance is found to increase as -ß lnT below Tmin, and as +AT2 above it. While Tmin appears to have a maximum around x = 0.5, no systematic concentration dependence is found in the variation of the other parameters describing the characteristic features of the resistivity. The experimental data are compared with the predictions from several theories in their low-temperature limits. It is found that the relation % MathType!MTEF!2!1!+-% feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4baFfea0dXde9vqpa0lb9% cq0dXdb9IqFHe9FjuP0-iq0dXdbba9pe0lb9hs0dXda91qaq-xfr-x% fj-hmeGabiqaaiaacaGaaeqabaWaaeaaeaaakeaacaqGWbGaeSipIO% JaaeylaiaabYgacaqGUbGaaeikaiaabsfadaahaaWcbeqaaiaabkda% aaGccqGHRaWkcqqHuoardaahaaWcbeqaaiaaikdaaaaaaa!3CA4!\[{\rm{p}} \sim {\rm{ - ln(T}}^{\rm{2}} + \Delta ^2 \] derived from the tunneling model adequately describes the low-temperature resistivity in these alloys. |
| Databáze: |
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