科研之友
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摘要
Recent experimental data on the optical conductivity of niobium-doped SrTiO3 are interpreted in terms of a gas of large polarons with effective coupling constant alpha(eff)approximate to 2. The theoretical approach takes into account many-body effects, the electron-phonon interaction with multiple LO-phonon branches, and the degeneracy and the anisotropy of the Ti t(2g) conduction band. Based on the Froumlhlich interaction, the many-body large polaron theory provides an interpretation for the essential characteristics, except-interestingly-for the unexpectedly large intensity of a peak at similar to 130 meV, of the observed optical conductivity spectra of SrTi1-xNbxO3 without any adjustment of material parameters.
- 出版日期2010-3
