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. 2017 Jul 14;3(7):e1603238. doi: 10.1126/sciadv.1603238

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Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 1 — (A) Topographic image of as-cleaved, FeSe-terminated surface (V_b = 100 mV and I = 50 pA); inset shows the surface lattice. (B) Low-energy dI/dV spectrum of as-cleaved FeSe surface, which displays double superconducting gaps of size Δ₁ = 15 meV and Δ₂ = 9 meV. a.u., arbitrary units. (C) Larger energy scale dI/dV spectrum. Arrows indicate the onset of the α and β bands (see text). Horizontal bar indicates the range of the δ band. (D) ARPES measurement of as-cleaved (Li_0.8Fe_0.2OH)FeSe. Solid curves track the dispersion of the β and δ bands, whereas the α band above E_F is sketched with red dashed curve.