Physics – Condensed Matter – Materials Science
Scientific paper
2007-12-28
Phys. Rev. B 79, 113103 (2009)
Physics
Condensed Matter
Materials Science
Scientific paper
We have studied the O 2p valence-band structure of Nb-doped SrTiO3, in which a dilute concentration of electrons are doped into the d0 band insulator, by angle-resolved photoemission spectroscopy (ARPES) measurements. We found that ARPES spectra at the valence band maxima at the M [k = (pi/a, pi/a, 0)]and R [k = (pi/a, pi/a, pi/a)] points start from ~ 3.3 eV below the Fermi level (EF), consistent with the indirect band gap of 3.3 eV and the EF position at the bottom of the conduction band. The peak position of the ARPES spectra were, however, shifted toward higher binding energies by ~ 500 meV from the 3.3 eV threshold. Because the bands at M and R have pure O 2p character, we attribute this ~ 500 meV shift to strong coupling of the oxygen p hole with optical phonons in analogy with the peak shifts observed for d-electron photoemission spectra in various transition-metal oxides.
Fujimori Atsushi
Kumigashira H.
Maekawa Koichiro
Oshima Masaharu
Takizawa Motokazu
No associations
LandOfFree
Effects of electron-phonon coupling in angle-resolved photoemission spectra of SrTiO3 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Effects of electron-phonon coupling in angle-resolved photoemission spectra of SrTiO3, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effects of electron-phonon coupling in angle-resolved photoemission spectra of SrTiO3 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-508167