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Inelastic x-ray scattering study of superconducting SmFeAsO1xFy single crystals: Evidence for strong momentum-dependent doping-induced renormalizations of optical phonons

M. Le Tacon, T. R. Forrest, Ch. Rüegg, A. Bosak, A. C. Walters, R. Mittal, H. M. Rønnow, N. D. Zhigadlo, S. Katrych, J. Karpinski, J. P. Hill, M. Krisch, and D. F. McMorrow
Phys. Rev. B 80, 220504(R) – Published 21 December 2009

Abstract

We report inelastic x-ray scattering experiments on the lattice dynamics in SmFeAsO and superconducting SmFeAsO0.60F0.35 single crystals. Particular attention was paid to the dispersions along the [100] direction of three optical modes close to 23 meV, polarized out of the FeAs planes. Remarkably, two of these modes are strongly renormalized upon fluorine doping. These results provide significant insight into the energy and momentum dependence of the coupling of the lattice to the electron system and underline the importance of spin-phonon coupling in the superconducting iron pnictides.

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  • Received 12 October 2009

DOI:https://doi.org/10.1103/PhysRevB.80.220504

©2009 American Physical Society

Authors & Affiliations

M. Le Tacon1,2, T. R. Forrest3, Ch. Rüegg3, A. Bosak1, A. C. Walters1,3, R. Mittal4, H. M. Rønnow5, N. D. Zhigadlo6, S. Katrych6, J. Karpinski6, J. P. Hill7, M. Krisch1, and D. F. McMorrow3

  • 1European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France
  • 2Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany
  • 3London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
  • 4Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
  • 5Laboratory for Quantum Magnetism, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
  • 6Laboratory for Solid State Physics, ETH Zürich, CH-8093 Zürich, Switzerland
  • 7Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, New York 11973, USA

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Issue

Vol. 80, Iss. 22 — 1 December 2009

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