Coherent and Incoherent States of Electron-doped SrTiO3

Y. Ishida; R. Eguchi; M. Matsunami; K. Horiba; M. Taguchi; A. Chainani; Y. Senba; H. Ohashi; H. Ohta; S. Shin

doi:10.1103/PhysRevLett.100.056401

Coherent and Incoherent States of Electron-doped SrTiO3

Strongly Correlated Electrons 2008-02-05 v1

Authors: Y. Ishida , R. Eguchi , M. Matsunami , K. Horiba , M. Taguchi , A. Chainani , Y. Senba , H. Ohashi , H. Ohta , S. Shin

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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.

Keywords

electron-doped SrTiO3 coherent state incoherent in-gap state resonant photoemission d-p hybridization spectral-weight transfer Ti 3d character

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@article{arxiv.0712.3083,
  title  = {Coherent and Incoherent States of Electron-doped SrTiO3},
  author = {Y. Ishida and R. Eguchi and M. Matsunami and K. Horiba and M. Taguchi and A. Chainani and Y. Senba and H. Ohashi and H. Ohta and S. Shin},
  journal= {arXiv preprint arXiv:0712.3083},
  year   = {2008}
}

Coherent and Incoherent States of Electron-doped SrTiO3

Abstract

Keywords

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