Effect of annealing on electron dephasing in three-dimensional polycrystalline metals

Details Effect of annealing on electron dephasing in three-dimensional polycrystalline metals Effect of annealing on electron dephasing in three-dimensional polycrystalline metals

Publishing date

2001-12-21

URL

arxiv.org/abs/cond-mat/0112421v1

Journals

Europhys. Lett. 57, 872 (2002)

Science

Physics

Field

Condensed Matter

SubField

Mesoscale and Nanoscale Physics

Type

Scientific paper

Digital Object Identifier

10.1209/epl/i2002-00591-8

Abstract

We have studied the effect of thermal annealing on electron dephasing times $\tau_\phi$ in three-dimensional polycrystalline metals. Measurements are performed on as-sputtered and annealed AuPd and Sb thick films, using weak-localization method. In all samples, we find that $\tau_\phi$ possesses an extremely weak temperature dependence as $T \to 0$. Our results show that the effect of annealing is non-universal, and it depends strongly on the amount of disorder quenched in the microstructures during deposition. The observed "saturation" behavior of $\tau_\phi$ cannot be easily explained by magnetic scattering. We suggest that the issue of saturation can be better addressed in three-dimensional, rather than lower-dimensional, structures.

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