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APS » Journals » Phys. Rev. Lett. » Volume 100 » Issue 22
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Phys. Rev. Lett. 100, 226403 (2008) [4 pages]

Electron-Phonon Interaction and Charge Carrier Mass Enhancement in SrTiO3

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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

Received 5 April 2007; revised 15 April 2008; published 6 June 2008

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.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.226403
DOI:
10.1103/PhysRevLett.100.226403
PACS:
71.38.−k, 72.20.−i, 78.20.−e
 
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