Scattering among electrons generates a distinct contribution to electrical resistivity that follows a quadratic temperature (T) dependence. In strongly correlated electron systems, the prefactor A of this T2 resistivity scales with the magnitude of the electronic specific heat, γ. Here we show that one can change the magnitude of A by four orders of magnitude in metallic strontium titanate (SrTiO3) by tuning the concentration of the carriers and, consequently, the Fermi energy. The T2 behavior persists in the single-band dilute limit despite the absence of two known mechanisms for T2 behavior: distinct electron reservoirs and Umklapp processes. The results highlight the absence of a microscopic theory for momentum decay through electron-electron scattering in various Fermi liquids.
- Pub Date:
- August 2015
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Materials Science;
- Condensed Matter - Superconductivity
- 24 pages icluding a supplement, 6 figures, 4 tables and 60 references