@article{Rettig:208515,
      title = {Ultrafast Structural Dynamics of the Fe-Pnictide Parent  Compound BaFe2As2},
      author = {Rettig, L. and Mariager, S. O. and Ferrer, A. and Gruebel,  S. and Johnson, J. A. and Rittmann, J. and Wolf, T. and  Johnson, S. L. and Ingold, G. and Beaud, P. and Staub, U.},
      publisher = {American Physical Society},
      journal = {Physical Review Letters},
      address = {College Pk},
      number = {6},
      volume = {114},
      pages = {5},
      year = {2015},
      abstract = {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.},
}