Ultrafast Structural Dynamics of the Fe-Pnictide Parent Compound BaFe2As2

Using femtosecond time-resolved x-ray diffraction we investigate the structural dynamics of the coherently excited A(1g) phonon mode in the Fe-pnictide parent compound BaFe2As2. The fluence dependent intensity oscillations of two specific Bragg reflections with distinctly different sensitivity to the pnictogen height in the compound allow us to quantify the coherent modifications of the Fe-As tetrahedra, indicating a transient increase of the Fe magnetic moments. By a comparison with time-resolved photoemission data, we derive the electron-phonon deformation potential for this particular mode. The value of Delta mu/Delta z = -(1.0-1.5)eV/angstrom is comparable with theoretical predictions and demonstrates the importance of this degree of freedom for the electron-phonon coupling in the Fe pnictides.


Published in:
Physical Review Letters, 114, 6
Year:
2015
Publisher:
College Pk, American Physical Society
ISSN:
0031-9007
Laboratories:




 Record created 2015-05-29, last modified 2018-01-28


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