Transient spin density wave order induced in the normal state of BaFe 2 As 2 by coherent lattice oscillations
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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
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Pashkin, A.
Department of Physics and Center for Applied Photonics, University of Konstanz, Germany
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Schäfer, H.
Department of Physics and Center for Applied Photonics, University of Konstanz, Germany
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Beyer, M.
Department of Physics and Center for Applied Photonics, University of Konstanz, Germany
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Porer, M.
Department of Physics and Center for Applied Photonics, University of Konstanz, Germany - Department of Physics, University of Regensburg, Germany
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Wolf, T.
Karlsruhe Institute of Technology, Institute for Solid State Physics, Germany
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Bernhard, Christian
University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Switzerland
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Demsar, J.
Department of Physics and Center for Applied Photonics, University of Konstanz, Germany - Complex Matter Department, Jozef Stefan Institute, Ljubljana, Slovenia
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Huber, R.
Department of Physics and Center for Applied Photonics, University of Konstanz, Germany - Department of Physics, University of Regensburg, Germany
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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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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.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Physics
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/303157
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