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We have systematically investigated the low-temperature electron dephasingtimes $\tau_\phi$ in more than 40 three-dimensional polycrystalline impuremetals with distinct material characteristics. In all cases, a saturation ofthe dephasing time is observed below about a (few) degree(s) Kelvin, dependingon samples. The value of the saturated dephasing time $\tau_0$ [$\equiv\tau_\phi (T \to 0 {\rm K})$] falls basically in the range 0.005 to 0.5 ns forall samples. Particularly, we find that $\tau_0$ scales with the electrondiffusion constant $D$ as $\tau_0 \sim D^{- \alpha}$, with $\alpha$ close to orslightly larger than 1, for over two decades of $D$ from about 0.1 to 10cm$^2$/s. Our observation suggests that the saturation behavior of $\tau_\phi$is universal and intrinsic in three-dimensional polycrystalline impure metals.A complete theoretical explanation is not yet available.Comment: 4 pages, 3 eps figure

Saturation of electron dephasing in three-dimensional polycrystalline disordered metals