Optical and electrical transport studies in Li0.1In2Se3

The far-IR reflectivity spectra for electrochemically lithium-intercalated layered crystal Li0.1In2Se3 exhibit a large Drude edge shift in comparison with the pristine material In2Se3. The analysis of the temperature dependence of the optical dielectric function yields a scattering rate τ−1α[(pT)2 + ω2] that is compatible with electron-electron scattering. The estimated plasma frequency ωp agrees with Hall effect data and the temperature variation of τ(T) is in accord with the d.c. resistivity.