Ultrafast structural dynamics of the orthorhombic distortion in the Fe-pnictide parent compound BaFe2As2

Using femtosecond time-resolved hard x-ray diffraction, we investigate the structural dynamics of the orthorhombic distortion in the Fe-pnictide parent compound BaFe2As2. The orthorhombic distortion analyzed by the transient splitting of the (1 0 3) Bragg reflection is suppressed on an initial timescale of 35 ps, which is much slower than the suppression of magnetic and nematic order. This observation demonstrates a transient state with persistent structural distortion and suppressed magnetic/nematic order which are strongly linked in thermal equilibrium. We suggest a way of quantifying the coupling between structural and nematic degrees of freedom based on the dynamics of the respective order parameters. (C) 2016 Author(s).


Published in:
Structural Dynamics, 3, 2, 023611
Presented at:
3rd International Conference on Ultrafast Structural Dynamics, Zurich, SWITZERLAND, JUN 10-12, 2015
Year:
2016
Publisher:
Melville, Amer Inst Physics
ISSN:
2329-7778
Laboratories:




 Record created 2016-07-19, last modified 2018-03-17


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