Observation of an Orbital Selective Electron-Mode Coupling in Fe-Based High-$T_c$ Superconductors

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dc.creatorRichard, P.
dc.creatorSato, T.
dc.creatorNakayama, K.
dc.creatorSouma, S.
dc.creatorTakahashi, T.
dc.creatorXu, Y. -M.
dc.creatorChen, G. F.
dc.creatorLuo, J. L.
dc.creatorWang, N. L.
dc.creatorDing, H.
dc.date2008-08-13
dc.date.accessioned2026-07-07T12:35:23Z
dc.date.available2026-07-07T12:35:23Z
dc.descriptionWe have performed an angle-resolved photoemission spectroscopy study of the new superconductor Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ in the low energy range. We report the observation of an anomaly around 25 meV in the dispersion of superconducting Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ samples that nearly vanishes above $T_c$. The energy scale of the related mode (13$\pm$2 meV) and its strong dependence on orbital and temperature indicates that it is unlikely related to phonons. Moreover, the momentum locations of the kink can be connected by the antiferromagnetic wavevector. Our results point towards an unconventional electronic origin of the mode and the superconducting pairing in the Fe-based superconductors, and strongly support the anti-phase s-wave pairing symmetry.
dc.description4 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0808.1809
dc.identifierhttp://arxiv.org/abs/0808.1809
dc.identifierPhysical Review Letters 102, 047003 (2009)
dc.identifierdoi:10.1103/PhysRevLett.102.047003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/217751
dc.subjectSuperconductivity
dc.titleObservation of an Orbital Selective Electron-Mode Coupling in Fe-Based High-$T_c$ Superconductors
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