Angle-resolved photoemission spectroscopy of the Fe-based Ba0.6K0.4Fe2As2 high temperature superconductor: Evidence for an orbital selective electron-mode coupling

P. Richard, T. Sato, K. Nakayama, S. Souma, T. Takahashi, Y. M. Xu, G. F. Chen, J. L. Luo, N. L. Wang, H. Ding

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66 Citations (Scopus)

Abstract

We have performed an angle-resolved photoemission spectroscopy study of the new superconductor Ba0.6K0.4Fe2As2 in the low energy range. We report the observation of an anomaly around 25 meV in the dispersion of superconducting Ba0.6K0.4Fe2As2 samples that nearly vanishes above Tc. The energy scale of the related mode (13±2meV) 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 wave vector. Our results point towards an unconventional electronic origin of the mode and the superconducting pairing in the Fe-based superconductors, and strongly support the antiphase s-wave pairing symmetry.

Original languageEnglish
Article number047003
JournalPhysical review letters
Volume102
Issue number4
DOIs
Publication statusPublished - 2009 Jan 26

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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