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We present the first angle-resolved photoemission (ARPES) measurement ofFermi Surface in the "misfit" cobaltate [Bi2Ba2O4].[CoO2]~2. This compoundcontains the same triangular Co planes as Na cobaltates, but in a different 3Denvironment. Our data establish the similarity of their electronic structure.We propose that the peculiar lineshape of all cobaltates is of the"peak-dip-hump" type, due to strong many-body effects. We detect a progressivetransfer of spectral weight from the quasiparticle feature near Ef to a broadhump in misfit phases where Ba is replaced by Sr or Ca. This indicates strongermany-body interactions in proximity of the band insulator regime, which weattribute to the presence of unusual magnetic excitations.

Direct observation of strong correlations near the band insulator regime of Bi misfit cobaltates