Ultrafast Structural Dynamics of the Fe-Pnictide Parent Compound BaFe2As2

L. Rettig, S. O. Mariager, A. Ferrer, S. Grübel, J. A. Johnson, J. Rittmann, T. Wolf, S. L. Johnson, G. Ingold, P. Beaud, and U. Staub
Phys. Rev. Lett. 114, 067402 – Published 13 February 2015
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Abstract

Using femtosecond time-resolved x-ray diffraction we investigate the structural dynamics of the coherently excited A1g phonon mode in the Fe-pnictide parent compound BaFe2As2. The fluence dependent intensity oscillations of two specific Bragg reflections with distinctly different sensitivity to the pnictogen height in the compound allow us to quantify the coherent modifications of the Fe-As tetrahedra, indicating a transient increase of the Fe magnetic moments. By a comparison with time-resolved photoemission data, we derive the electron-phonon deformation potential for this particular mode. The value of Δμ/Δz=(1.01.5)eV/Å is comparable with theoretical predictions and demonstrates the importance of this degree of freedom for the electron-phonon coupling in the Fe pnictides.

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  • Received 3 November 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.067402

© 2015 American Physical Society

Authors & Affiliations

L. Rettig1,*, S. O. Mariager1, A. Ferrer2,1, S. Grübel1, J. A. Johnson1, J. Rittmann3,1, T. Wolf4, S. L. Johnson2, G. Ingold1,5, P. Beaud1,5, and U. Staub1

  • 1Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 2Institute for Quantum Electronics, Physics Department, ETH Zürich, CH-8093 Zürich, Switzerland
  • 3Ecole Polytechnique Fédérale de Lausanne, Laboratoire de Spectroscopie Ultrarapide, ISIC, FSB, CH-1015 Lausanne, Switzerland
  • 4Karlsruhe Institute of Technology, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany
  • 5SwissFEL, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

  • *Corresponding author. laurenz.rettig@psi.ch

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Issue

Vol. 114, Iss. 6 — 13 February 2015

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