Song, Can-LiWang, Yi-LinJiang, Ye-PingLi, ZhiWang, LiliHe, KeChen, XiHoffman, JennyMa, Xu-CunXue, Qi-Kun2014-08-252014Song, 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): 057002.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:12748088Scanning 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.en-USJournal Article2014-08-08Can-Li Song, Yi-Lin Wang, Ye-Ping Jiang, Zhi Li, Lili Wang, Ke He, Xi Chen, Jennifer E. Hoffman, Xu-Cun Ma, Qi-Kun Xue2014-08-2510.1103/PhysRevLett.112.057002