English

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

Superconductivity 2009-01-30 v1

Abstract

We have performed an angle-resolved photoemission spectroscopy study of the new superconductor Ba0.6_{0.6}K0.4_{0.4}Fe2_2As2_2 in the low energy range. We report the observation of an anomaly around 25 meV in the dispersion of superconducting Ba0.6_{0.6}K0.4_{0.4}Fe2_2As2_2 samples that nearly vanishes above TcT_c. The energy scale of the related mode (13±\pm2 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.

Keywords

Cite

@article{arxiv.0808.1809,
  title  = {Observation of an Orbital Selective Electron-Mode Coupling in Fe-Based High-$T_c$ Superconductors},
  author = {P. Richard and T. Sato and K. Nakayama and S. Souma and T. Takahashi and Y. -M. Xu and G. F. Chen and J. L. Luo and N. L. Wang and H. Ding},
  journal= {arXiv preprint arXiv:0808.1809},
  year   = {2009}
}

Comments

4 pages, 3 figures

R2 v1 2026-06-21T11:09:58.107Z