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Fermi surface and band renormalization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Sr</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mtext>K</mml:mtext><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub…
High-resolution angle-resolved photoemission measurements have been carried out on the $(\text{Sr},\text{K}){\text{Fe}}_{2}{\text{As}}_{2}$ superconductor $({T}_{c}=21\text{ }\text{K})$. Three holelike Fermi-surface sheets are resolved around the $\ensuremath{\Gamma}$ point. One electronlike Fermi surface and strong Fermi spots are observed near the $M(\ensuremath{\pi},\ensuremath{\pi})$ point which are different from a round electron pocket expected from band calculations. …