Bandwidth and Electron Correlation-Tuned Superconductivity in Rb${}_{0.8}$Fe${}_2$(Se${}_{1-z}$S${}_z$)${}_2$

Abstract

We present a systematic angle-resolved photoemission spectroscopy study of the substitution-dependence of the electronic structure of Rb${}_{0.8}$Fe${}_2$(Se${}_{1-z}$S${}_z$)${}_2$ (z = 0, 0.5, 1), where superconductivity is continuously suppressed into a metallic phase. Going from the non-superconducting Rb${}_{0.8}$Fe${}_2$(Se${}_{1-z}$S${}_z$)${}_2$ to superconducting Rb${}_{0.8}$Fe${}_2$Se${}_2$, we observe little change of the Fermi surface topology, but a reduction of the overall bandwidth by a factor of 2 as well as an increase of the orbital-dependent renormalization in the $d_{xy}$ orbital. Hence for these heavily electron-doped iron chalcogenides, we have identified electron correlation as explicitly manifested in the quasiparticle bandwidth to be the important tuning parameter for superconductivity, and that moderate correlation is essential to achieving high $T_C$.

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• High Temperature Superconductivity in Iron Pnictides and Chalcogenides
• Orbital selectivity enhanced by nematic order in FeSe
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Orientation-dependent electron-phonon coupling in interfacial superconductors LaAlO3/KTaO3
• Transition from sign-reversed to sign-preserved Cooper-pairing symmetry in sulfur-doped iron selenide superconductors
• Highly mobile carriers in orthorhombic phases of iron-based superconductors FeSe${}_{1-x}$S${}_x$
• Elucidating the magnetic and superconducting phases in the alkali metal intercalated iron chalcogenides
• Tuning orbital-selective correlation effects in superconducting Rb${}_{0.75}$Fe${}_{1.6}$Se${}_{2-z}$S${}_z$
• Concomitant enhancement of electron-phonon coupling and electron-electron interaction in graphene decorated with ytterbium
• Magnetic-Field-Induced Spin Nematicity in FeSe1-xSx and FeSe1-yTey Superconductor Systems
• Structure, superconductivity, and magnetism in Rb1-xFe1.6Se2-zSz
• Observation of a C-type short range antiferromagnetic order in expanded FeS