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High resolution angle-resolved photoemission measurements have been carriedout on (Sr,K)Fe$_2$As$_2$ superconductor (Tc=21 K). Three hole-like Fermisurface sheets are clearly resolved for the first time around the Gamma point.The overall electronic structure shows significant difference from the bandstructure calculations. Qualitative agreement between the measured andcalculated band structure is realized by assuming a chemical potential shift of-0.2 eV. The obvious band renormalization suggests the importance of electroncorrelation in understanding the electronic structure of the Fe-basedcompounds.

Fermi Surface and Band Renormalization in (Sr,K)Fe$_2$As$_2$ Superconductor from Angle-Resolved Photoemission Spectroscopy