Coupling of the A_{1g} As-phonon to magnetism in iron pnictides

Abstract

Charge, spin and lattice degrees of freedom are strongly entangled in iron superconductors. A neat consequence of this entanglement is the behavior of the A_{1g} As-phonon resonance in the different polarization symmetries of Raman spectroscopy when undergoing the magneto-structural transition. In this work we show that the observed behavior could be a direct consequence of the coupling of the phonons with the electronic excitations in the anisotropic magnetic state. We discuss this scenario within a five orbital tight-binding model coupled to phonons via the dependence of the Slater-Koster parameters on the As position. We identify two qualitatively different channels of the electron-phonon interaction: a geometrical one related to the Fe-As-Fe angle and another one associated with the modification upon As displacement of the Fe-As energy integrals pdsigma and pdpi. While both mechanisms result in a finite B_{1g} response, the behavior of the phonon intensity in the A_{1g} and B_{1g} Raman polarization geometries is qualitatively different when the coupling is driven by the angle or by the energy integral dependence. We discuss our results in view of the experimental reports.

10 pages including 7 figures

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• Strong Pressure Dependent Electron-Phonon Coupling in FeSe
• Magnetic interactions in iron superconductors: A review
• Ultrafast structural dynamics of the Fe-pnictide parent compound BaFe2As2
• Thickness-Dependent Coherent Phonon Frequency in Ultrathin FeSe/SrTiO${}_3$ Films
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• Nematic Fluctuations and Phase Transitions in LaFeAsO: a Raman Scattering Study
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