  Contrary to the common belief that electron-electron interaction (EEI) should
be negligible in s-orbital-based conductors, we demonstrated that the EEI
effect could play a significant role on electronic transport leading to the
misinterpretation of the Hall data. We show that the EEI effect is primarily
responsible for an increase in the Hall coefficient in the La-doped SrSnO3
films below 50 K accompanied by an increase in the sheet resistance. The
quantitative analysis of the magnetoresistance (MR) data yielded a large phase
coherence length of electrons exceeding 450 nm at 1.8 K and revealed the
electron-electron interaction being accountable for breaking of electron phase
coherency in La-doped SrSnO3 films. These results while providing critical
insights into the fundamental transport behavior in doped stannates also
indicate the potential applications of stannates in quantum coherent electronic
devices owing to their large phase coherence length.
