Electron-Phonon Interaction and Charge Carrier Mass Enhancement in SrTiO3

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Title		Electron-Phonon Interaction and Charge Carrier Mass Enhancement in SrTiO3
Authors		Van Mechelen, J. L. M. Van der Marel, D. Grimaldi, C. Kuzmenko, A. B. Armitage, N. P. Reyren, Nicolas Hagemann, Hans-Rudolf 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.
Identifiers		DOI: 10.1103/PhysRevLett.100.226403
Full text		Article (Published version) - Free access
Structures		Faculté des sciences / Section de chimie et biochimie / Département de chimie physique
Research group		Groupe Hagemann
Citation (ISO format)		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