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

Kim, Kyung Wan; Pashkin, A.; Schäfer, H.; Beyer, M.; Porer, M.; Wolf, T.; Bernhard, Christian; Demsar, J.; Huber, R.; Leitenstorfer, A.

doi:10.1051/epjconf/20134103012

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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

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

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