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, and I. I. Mazin
Phys. Rev. Lett. 100, 226403 – Published 6 June 2008

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 (<2meV) 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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  • Received 5 April 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.226403

©2008 American Physical Society

Authors & Affiliations

J. L. M. van Mechelen1, D. van der Marel1, C. Grimaldi1,2, A. B. Kuzmenko1, N. P. Armitage1,3, N. Reyren1, H. Hagemann4, and I. I. Mazin5

  • 1Département de Physique de la Matière Condensée, Université de Genève, Genève, Switzerland
  • 2LPM, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
  • 3Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA
  • 4Département de Chimie Physique, Université de Genève, Genève, Switzerland
  • 5Center for Computational Materials Science, Naval Research Laboratory, Washington, D.C. 20375, USA

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Issue

Vol. 100, Iss. 22 — 6 June 2008

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