Ultrafast structural dynamics of the Fe-pnictide parent compound BaFe2As2

L. Rettig; S. O. Mariager; A. Ferrer; S. Grübel; J. A. Johnson; J. Rittmann; T. Wolf; S. L. Johnson; G. Ingold; P. Beaud; U. Staub

doi:10.1103/PhysRevLett.114.067402

Ultrafast structural dynamics of the Fe-pnictide parent compound BaFe2As2

Superconductivity 2015-02-17 v1

Authors: L. Rettig , S. O. Mariager , A. Ferrer , S. Grübel , J. A. Johnson , J. Rittmann , T. Wolf , S. L. Johnson , G. Ingold , P. Beaud , U. Staub

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Abstract

Using femtosecond time-resolved x-ray diffraction we investigate the structural dynamics of the coherently excited A1g 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/A is comparable with theoretical predictions and demonstrates the importance of this degree of freedom for the electron-phonon coupling in the Fe pnictides.

Keywords

ultrafast structural dynamics Fe-pnictide BaFe2As2 femtosecond x-ray diffraction A1g phonon mode electron-phonon coupling Fe magnetic moments

Cite

@article{arxiv.1411.0718,
  title  = {Ultrafast structural dynamics of the Fe-pnictide parent compound BaFe2As2},
  author = {L. Rettig and S. O. Mariager and A. Ferrer and S. Grübel and J. A. Johnson and J. Rittmann and T. Wolf and S. L. Johnson and G. Ingold and P. Beaud and U. Staub},
  journal= {arXiv preprint arXiv:1411.0718},
  year   = {2015}
}

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5 pages, 4 figures, Supplementary material

Ultrafast structural dynamics of the Fe-pnictide parent compound BaFe2As2

Abstract

Keywords

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