Journal article

Transient spin density wave order induced in the normal state of BaFe 2 As 2 by coherent lattice oscillations

  • Kim, Kyung Wan Department of Physics and Center for Applied Photonics, University of Konstanz, Germany - University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland - Department of Physics, Chungbuk National University, Cheongju, Korea
  • Pashkin, A. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany
  • Schäfer, H. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany
  • Beyer, M. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany
  • Porer, M. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany - Department of Physics, University of Regensburg, Germany
  • Wolf, T. Karlsruhe Institute of Technology, Institute for Solid State Physics, Germany
  • Bernhard, Christian University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
  • Demsar, J. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany - Complex Matter Department, Jozef Stefan Institute, Ljubljana, Slovenia
  • Huber, R. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany - Department of Physics, University of Regensburg, Germany
  • Leitenstorfer, A. Department of Physics and Center for Applied Photonics, University of Konstanz, Germany - Department of Physics, University of Regensburg, Germany
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    13.03.2013
Published in:
  • EPJ Web of Conferences. - 2013, vol. 41, p. 03012
English We trace the ultrafast dynamics of the spin density wave gap of the pnictide system BaFe2As2 probing resonantly with broadband multi-terahertz pulses. The photoexcitation in the low-temperature ground state leads to a fast suppression of the spin order followed by a slower recovery process. Surprisingly, in the normal state, we observe periodic oscillations of the spin density wave feature at a frequency as high as 5.5 THz. Our results indicate a transient development of a macroscopic order driven by a coherent lattice oscillation and attest to a pronounced spin–phonon coupling in pnictides.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/303157
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