Transient spin density wave order induced in the normal state of BaFe2As2 by coherent lattice oscillations

Kim, Kyungwan; Pashkin, Alexej; Schäfer, Hanjo; Beyer, Markus; Porer, Michael; Wolf, Thomas; Bernhard, Christian; Demsar, Jure GND; Huber, Rupert; Leitenstorfer, Alfred

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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Kim, K., Pashkin, A., Schäfer, H., Beyer, M., Porer, M., Wolf, T., Bernhard, C., Demsar, J., Huber, R., Leitenstorfer, A., 2013. Transient spin density wave order induced in the normal state of BaFe2As2 by coherent lattice oscillations. European physical journal / Web of Conferences 41, 2013, art. 03012. https://doi.org/10.1051/epjconf/20134103012
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