Scaling of the superconducting gap with orbital character in FeSe

Luke C. Rhodes, Matthew D. Watson*, Amir A. Haghighirad, Daniil V. Evtushinsky, Matthias Eschrig, Timur K. Kim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

We use high-resolution angle-resolved photoemission spectroscopy to map the three-dimensional momentum dependence of the superconducting gap in FeSe. We find that on both the hole and electron Fermi surfaces, the magnitude of the gap follows the distribution of dyz orbital weight. Furthermore, we theoretically determine the momentum dependence of the superconducting gap by solving the linearized gap equation using a tight-binding model which quantitatively describes both the experimental band dispersions and orbital characters. By considering a Fermi surface only including one electron pocket, as observed spectroscopically, we obtain excellent agreement with the experimental gap structure. Our finding of a scaling between the superconducting gap and the dyz orbital weight supports the interpretation of superconductivity mediated by spin fluctuations in FeSe.

Original languageEnglish
Article number180503(R)
Number of pages6
JournalPhysical Review B
Volume98
Issue number18
DOIs
Publication statusPublished - 14 Nov 2018

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