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Open Access Publications from the University of California

Ubiquitous strong electron-phonon coupling at the interface of FeSe/SrTiO3.

  • Author(s): Zhang, Chaofan
  • Liu, Zhongkai
  • Chen, Zhuoyu
  • Xie, Yanwu
  • He, Ruihua
  • Tang, Shujie
  • He, Junfeng
  • Li, Wei
  • Jia, Tao
  • Rebec, Slavko N
  • Ma, Eric Yue
  • Yan, Hao
  • Hashimoto, Makoto
  • Lu, Donghui
  • Mo, Sung-Kwan
  • Hikita, Yasuyuki
  • Moore, Robert G
  • Hwang, Harold Y
  • Lee, Dunghai
  • Shen, Zhixun
  • et al.

The observation of replica bands in single-unit-cell FeSe on SrTiO3 (STO)(001) by angle-resolved photoemission spectroscopy (ARPES) has led to the conjecture that the coupling between FeSe electrons and the STO phonons are responsible for the enhancement of Tc over other FeSe-based superconductors. However the recent observation of a similar superconducting gap in single-unit-cell FeSe/STO(110) raised the question of whether a similar mechanism applies. Here we report the ARPES study of the electronic structure of FeSe/STO(110). Similar to the results in FeSe/STO(001), clear replica bands are observed. We also present a comparative study of STO(001) and STO(110) bare surfaces, and observe similar replica bands separated by approximately the same energy, indicating this coupling is a generic feature of the STO surfaces and interfaces. Our findings suggest that the large superconducting gaps observed in FeSe films grown on different STO surface terminations are likely enhanced by a common mechanism.

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