We have measured the electron-phonon scattering rates 1/τep from a weak-localization study of a series of high-resistivity tin-doped Ti73Al27 alloys. The resistivities of these alloys are essentially the same and are so high that the electron elastic mean free path l approaches the interatomic spacing, resulting in a very small value of qphl≈0.0056T (qph is the wave number of the thermal phonons, and T is the temperature). Based on as many as about 60 magnetoresistivity measurements between 2 and 22 K, we are able to determine the dependence of 1/τep on T to within a great degree of accuracy and find that 1/τep varies essentially with T2 in the dirty limit (qphl≪1). This observation is not understood in terms of the current theoretical concept of electron-phonon interaction in disordered metals.
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1 Aug 1999|