Many-body large polaron optical conductivity in SrTi1-xNb xO3

J.T. Devreese, S.N. Klimin, J.L.M. van Mechelen, D. van der Marel

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Abstract

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 αeff ≈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 Fröhlich 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 ∼130 meV, of the observed optical conductivity spectra of SrTi 1-xNbxO3 without any adjustment of material parameters.

Original languageEnglish
Article number125119
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number12
DOIs
Publication statusPublished - 23 Mar 2010
Externally publishedYes

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