Linear mean free path and quadratic temperature dependence of electron-phonon scattering rate in V82Al18-xFex alloys at low temperature

摘要

We have reported a comprehensive study on temperature and disorder dependence of inelastic electron dephasing scattering rate in disordered V82 Al 18-xFex alloys. The dephasing scattering time has been measured by analysis of low field magnetoresistance using the weak localization theory. In absence of magnetic field the variation of low temperature resistivity rise follows the relation Δ ρ ( T ) ∝ ? ρ 0 5 / 2 T , which is well described by three-dimensional electron-electron interactions. The temperature-independent dephasing rate strongly depends on disorder and follows the relation τ 0 ? 1 ∝ l e , where le is the electron elastic mean free path. The inelastic electron-phonon scattering rate obeying the anomalous relation τ e ? p h ? 1 ∝ T 2 l e . This anomalous behavior of τ e ? p h ? 1 cannot be explained in terms of current theories for electron-phonon scattering in impure dirty conductors.