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16 April 2024

» arxiv » 0712.1607

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Electron-phonon interaction and charge carrier mass enhancement in SrTiO3
J.L.M. van Mechelen ; D. van der Marel ; C. Grimaldi ; A.B. Kuzmenko ; N.P. Armitage ; N. Reyren ; H. Hagemann ; I.I. Mazin ;
Date:	10 Dec 2007
Abstract:	We report a comprehensive THz, infrared and optical study of Nb doped SrTiO3 as well as DC conductivity and Hall effect measurements. Our THz spectra at 7K show the presence of a very narrow (<2 meV) Drude peak, the spectral weight of which shows approximately a factor of three enhancement of the band mass for all carrier concentrations. The missing spectral weight is regained in a broad ’mid-infrared’ band which originates from electron-phonon coupling. We find no evidence of a particularly large electron-phonon coupling that would result in small polaron formation. Analysis of the results yields an electron-phonon coupling parameter of an intermediate strength, $alpha approx 4$.
Source:	arXiv, 0712.1607
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