Coherent and Incoherent States of Electron-doped SrTiO3

Abstract

Resonant photoemission at the Ti 2p and O 1s edges on a Nb-doped SrTiO3 thin film revealed that the coherent state (CS) at the Fermi level (EF) had mainly Ti 3d character whereas the incoherent in-gap state (IGS) positioned ~1.5 eV below EF had mixed character of Ti 3d and O 2p states. This indicates that the IGS is formed by a spectral-weight transfer from the CS and subsequent spectral-weight redistribution through d-p hybridization. We discuss the evolution of the excitation spectrum with 3d band filling and rationalize the IGS through a mechanism similar to that proposed by Haldane and Anderson.

References in corpus (3)

• Magnetic effects at the interface between nonmagnetic oxides
• Bulk screening in core level photoemission from Mott-Hubbard and Charge-Transfer systems
• Low temperature metallic state induced by electrostatic carrier doping of SrTiO${}_3$

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