Redistribution of the spectral intensity in a layered 4d-electron superconductor Sr₂RuO₄ observed by the photoemission spectroscopy

Spectra from photoemission spectroscopy (PES) of a recently discovered layered-perovskite superconductor Sr2RuO4 are reported. The PES spectrum of Sr2RuO4 around the Fermi level (EF) is apparently different from the non-interacting density of states obtained by a band calculation, suggesting the importance of strong electron correlation in this system.