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Electron-Phonon Interaction and Charge Carrier Mass Enhancement in SrTiO3

Van Mechelen, J. L. M.
Van der Marel, D.
Grimaldi, C.
Kuzmenko, A. B.
Armitage, N. P.
Mazin, I. I.
Published in Physical review letters. 2008, vol. 100, no. 22, 226403
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 7 K show the presence of an unusually narrow (<2 meV) Drude peak. For all carrier concentrations the Drude spectral weight shows a factor of three mass enhancement relative to the effective mass in the local density approximation, whereas the spectral weight contained in the incoherent midinfrared response indicates that the mass enhancement is at least a factor two. We find no evidence of a particularly large electron-phonon coupling that would result in small polaron formation.
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Research group Groupe Hagemann
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VAN MECHELEN, J. L. M. et al. Electron-Phonon Interaction and Charge Carrier Mass Enhancement in SrTiO3. In: Physical Review Letters, 2008, vol. 100, n° 22, p. 226403. doi: 10.1103/PhysRevLett.100.226403 https://archive-ouverte.unige.ch/unige:3573

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Deposited on : 2009-10-02

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