Contrasting behavior of homovalent-substituted and hole-doped systems: O K-edge spectra from LaNi1-xMxO3 (M=Mn, Fe, and Co) and La1-xSrxMnO3

D. D. Sarma, O. Rader, T. Kachel, A. Chainani, M. Mathew, K. Holldack, W. Gudat, W. Eberhardt

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65 Citations (Scopus)

Abstract

We report x-ray-absorption spectra at the oxygen K edge for LaNi1-xMxO3 (M=Mn, Fe, and Co) for values of x spanning the entire composition range which exhibit metal-insulator transitions at critical values of x. This study clearly shows that the metal-insulator transition in the homovalent substituted series is achieved by transferring hole states from near EF to an energy position above EF due to the potential of the substituent. This is in strong contrast to hole doping, e.g., as in La1-xSrxMnO3, where states are formed within the band gap of the underlying electronic structure. The sensitivity of the O K-edge spectra to substitution confirms the large oxygen 2p admixture to states at the Fermi level due to a substantial hopping interaction strength between the transition-metal 3d and oxygen 2p derived states in these perovskite oxides. The present results suggest that the electronic structures of these perovskite oxides are dominated by local interactions.

Original languageEnglish
Pages (from-to)14238-14243
Number of pages6
JournalPhysical Review B
Volume49
Issue number20
DOIs
Publication statusPublished - 1994 Jan 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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