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Scaling of the superconducting gap with orbital character in FeSe

DOI: 10.1103/PhysRevB.98.180503 DOI Help

Authors: Luke C. Rhodes (Diamond Light Source; Royal Holloway, University of London) , Matthew D. Watson (Diamond Light Source; University of St. Andrews) , Amir A. Haghighirad (University of Oxford; Karlsruhe Institute of Technology) , Daniil Evtushynsky (Ecole Polytechnique Federale Lausanne) , Matthias Eschrig (Royal Holloway, University of London) , Timur K. Kim (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 98

State: Published (Approved)
Published: November 2018
Diamond Proposal Number(s): 17532

Open Access Open Access

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 d y z 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 d y z orbital weight supports the interpretation of superconductivity mediated by spin fluctuations in FeSe.

Subject Areas: Physics, Materials

Instruments: I05-ARPES