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

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

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Title: Imaging the Electron-Boson Coupling in Superconducting FeSe Films Using a Scanning Tunneling Microscope
Author: Song, Can-Li; Wang, Yi-Lin; Jiang, Ye-Ping; Li, Zhi; Wang, Lili; He, Ke; Chen, Xi; Hoffman, Jennifer Eve; Ma, Xu-Cun; Xue, Qi-Kun

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Citation: Song, Can-Li, Yi-Lin Wang, Ye-Ping Jiang, Zhi Li, Lili Wang, Ke He, Xi Chen, Jennifer E. Hoffman, Xu-Cun Ma, and Qi-Kun Xue. 2014. “Imaging the Electron-Boson Coupling in Superconducting FeSe Films Using a Scanning Tunneling Microscope.” Physical Review Letters 112 (5) (February): 057002.
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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.
Published Version: doi:10.1103/PhysRevLett.112.057002
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Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12748088
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