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Imaging the Electron-Boson Coupling in Superconducting FeSe Films Using a Scanning Tunneling Microscope

Journal Article


Abstract


  • Scanning tunneling spectroscopy has been used to reveal signatures of a bosonic mode in the local

    quasiparticle density of states of superconducting FeSe films. The mode appears below Tc as a “dip-hump”

    feature at energy Ω ∼ 4.7kBTc beyond the superconducting gap Δ. Spectra on strained regions of the FeSe

    films reveal simultaneous decreases in Δ and Ω. This contrasts with all previous reports on other high-Tc

    superconductors, where Δ locally anticorrelates with Ω. A local strong coupling model is found to

    reconcile the discrepancy well, and to provide a unified picture of the electron-boson coupling in

    unconventional superconductors.

Authors


  •   Song, Canli (external author)
  •   Wang, Yi-Lin (external author)
  •   Jiang, Yeping (external author)
  •   Li, Zhi
  •   Wang, Lili (external author)
  •   He, Ke (external author)
  •   Chen, Xi (external author)
  •   Hoffman, Jennifer E. (external author)
  •   Ma, Xu-Cun (external author)
  •   Xue, Qi-Kun (external author)

Publication Date


  • 2014

Citation


  • Song, C., Wang, Y., Jiang, Y., Li, Z., Wang, L., He, K., Chen, X., Hoffman, J. E., Ma, X. & Xue, Q. (2014). Imaging the Electron-Boson Coupling in Superconducting FeSe Films Using a Scanning Tunneling Microscope. Physical Review Letters, 112 057002-1-057002-5.

Scopus Eid


  • 2-s2.0-84894486411

Start Page


  • 057002-1

End Page


  • 057002-5

Volume


  • 112

Place Of Publication


  • United States

Abstract


  • Scanning tunneling spectroscopy has been used to reveal signatures of a bosonic mode in the local

    quasiparticle density of states of superconducting FeSe films. The mode appears below Tc as a “dip-hump”

    feature at energy Ω ∼ 4.7kBTc beyond the superconducting gap Δ. Spectra on strained regions of the FeSe

    films reveal simultaneous decreases in Δ and Ω. This contrasts with all previous reports on other high-Tc

    superconductors, where Δ locally anticorrelates with Ω. A local strong coupling model is found to

    reconcile the discrepancy well, and to provide a unified picture of the electron-boson coupling in

    unconventional superconductors.

Authors


  •   Song, Canli (external author)
  •   Wang, Yi-Lin (external author)
  •   Jiang, Yeping (external author)
  •   Li, Zhi
  •   Wang, Lili (external author)
  •   He, Ke (external author)
  •   Chen, Xi (external author)
  •   Hoffman, Jennifer E. (external author)
  •   Ma, Xu-Cun (external author)
  •   Xue, Qi-Kun (external author)

Publication Date


  • 2014

Citation


  • Song, C., Wang, Y., Jiang, Y., Li, Z., Wang, L., He, K., Chen, X., Hoffman, J. E., Ma, X. & Xue, Q. (2014). Imaging the Electron-Boson Coupling in Superconducting FeSe Films Using a Scanning Tunneling Microscope. Physical Review Letters, 112 057002-1-057002-5.

Scopus Eid


  • 2-s2.0-84894486411

Start Page


  • 057002-1

End Page


  • 057002-5

Volume


  • 112

Place Of Publication


  • United States