Electronic Structure of Layered Perovskite LaSrMO_4 (M=Cr, Mn, Fe and Co)

Abstract

Optical study of trivalent 3d transition metal oxide compoundsLaSrMO₄ (M=Cr, Mn, Fe and Co) with layered perovskite structure hasrevealed fundamental features of their electronicstructures. Systematic change of the charge-transfer gap (E_gap)with the 3d element (M) can be explained by a simple ionic model. Thespectrum below -- 7 eV is found to be strongly M-dependent, and isinterpreted in terms of multiplet splitting of the final 3d^N+1state.