Transient Spin Density Wave Order Induced in the Normal State of BaFe2As2 by Coherent Lattice Oscillations

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Ultrafast Quantum Physics in Amplitude and Phase - UltraPhase, ERC Advanced Grant
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CHERGUI, Majed, ed. and others. XVIIIth International Conference on Ultrafast Phenomena : Lausanne, Switzerland, July 8-13, 2012. Les Ulis: EDP Sciences, 2013, 03012. EPJ Web of Conferences. 41. eISSN 2100-014X. ISBN 978-2-7598-0956-1. Available under: doi: 10.1051/epjconf/20134103012
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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.

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XVIIIth International Conference on Ultrafast Phenomena, 8. Juli 2012 - 13. Juli 2012, Lausanne
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ISO 690KIM, Kyungwan, Alexej PASHKIN, Hanjo SCHÄFER, Markus BEYER, Michael PORER, Thomas WOLF, Christian BERNHARD, Jure DEMSAR, Rupert HUBER, Alfred LEITENSTORFER, 2013. Transient Spin Density Wave Order Induced in the Normal State of BaFe2As2 by Coherent Lattice Oscillations. XVIIIth International Conference on Ultrafast Phenomena. Lausanne, 8. Juli 2012 - 13. Juli 2012. In: CHERGUI, Majed, ed. and others. XVIIIth International Conference on Ultrafast Phenomena : Lausanne, Switzerland, July 8-13, 2012. Les Ulis: EDP Sciences, 2013, 03012. EPJ Web of Conferences. 41. eISSN 2100-014X. ISBN 978-2-7598-0956-1. Available under: doi: 10.1051/epjconf/20134103012
BibTex
@inproceedings{Kim2013-03-13Trans-41858,
  year={2013},
  doi={10.1051/epjconf/20134103012},
  title={Transient Spin Density Wave Order Induced in the Normal State of BaFe<sub>2</sub>As<sub>2</sub> by Coherent Lattice Oscillations},
  number={41},
  isbn={978-2-7598-0956-1},
  publisher={EDP Sciences},
  address={Les Ulis},
  series={EPJ Web of Conferences},
  booktitle={XVIIIth International Conference on Ultrafast Phenomena : Lausanne, Switzerland, July 8-13, 2012},
  editor={Chergui, Majed},
  author={Kim, Kyungwan and Pashkin, Alexej and Schäfer, Hanjo and Beyer, Markus and Porer, Michael and Wolf, Thomas and Bernhard, Christian and Demsar, Jure and Huber, Rupert and Leitenstorfer, Alfred},
  note={Article Number: 03012}
}
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