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Bandwidth and Electron Correlation-Tuned Superconductivity in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Rb</mml:mi></mml:mrow><mml:mrow><mml:mn>0.8</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mrow><mml:mi>Se</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>z</mml:mi></…
We present a systematic angle-resolved photoemission spectroscopy study of the substitution dependence of the electronic structure of ${\mathrm{Rb}}_{0.8}{\mathrm{Fe}}_{2}({\mathrm{Se}}_{1\ensuremath{-}z}{\mathrm{S}}_{z}{)}_{2}$ ($z=0$, 0.5, 1), where superconductivity is continuously suppressed into a metallic phase. Going from the nonsuperconducting ${\mathrm{Rb}}_{0.8}{\mathrm{Fe}}_{2}{\mathrm{S}}_{2}$ to superconducting ${\mathrm{Rb}}_{0.8}{\mathrm{Fe}}_{2}{\mathrm{Se}}_{2}$, we observe little change of the Fermi surface topology, but a reduction …