Fig. 3 | npj Quantum Materials

Fig. 3

From: Evolution of the low-temperature Fermi surface of superconducting FeSe1−xSx across a nematic phase transition

Fig. 3

Evolution of the electronic properties of FeSe1−xSx. a Phase diagram of FeSe1−xSx as a function of sulphur substitution, x indicating the suppression of the nematic phase (Ts, solid triangles) and the presence of a small dome of superconductivity (Tc, solid circles) using data from Supplementary Fig. S1. b Proposed phase diagram of FeSe under pressure based on ref. 7 showing the low Tc (SC1) and high Tc superconducting phases (SC2) as well as the magnetic phase. c The evolution of the observed quantum oscillations frequencies. Solid lines are the calculated frequencies for the large outer hole band based on ARPES data from ref. 9. The dashed lines are guides to the eye. d The quasiparticle effective masses of the high frequencies, γ and δ and the dominant low frequency, χ. Dashed lines are guides to the eye. e, f Proposed Fermi surfaces of FeSe1−xSx for different values of x as a slice at kz = π/c and kz = 0 (for Γ point) and 3D representation, respectively. In e for x = 0 (bottom) we sketched additional scenarios discussed in literature for the orbits originating from the electron bands5,19,22

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