eg-level splitting in a layered perovskite manganite as revealed by charge modulation spectroscopy

Masao Nakamura, Masashi Kawasaki, and Yoshinori Tokura
Phys. Rev. B 86, 125127 – Published 18 September 2012

Abstract

An orbital degree of freedom in Mott insulators gives strong impact on their phase transitions induced by the band-filling control or carrier doping. We have investigated the effect of electrostatic carrier doping on the electronic spectra for a layered Mott insulator Sr2MnO4 to reveal orbital-specific optical transitions. Sr2MnO4 is an n-type Mott insulator and its conduction band is composed of nearly degenerated eg orbitals dx2y2 and d3z2r2. The charge modulation spectra for a rectifying Sr2MnO4/Nb-doped SrTiO3 junction clearly revealed an optical transition at 1.7 eV, while a linear absorption spectrum is dominated by a transition at 2.0 eV. These are assigned to the transitions from O 2p to Mn d3z2r2 and to dx2y2, respectively. The accumulated charges with a density as high as 8×1013 cm2 selectively occupy the nearly localized d3z2r2 orbitals that hardly contribute to charge transport.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 26 March 2012

DOI:https://doi.org/10.1103/PhysRevB.86.125127

©2012 American Physical Society

Authors & Affiliations

Masao Nakamura1,*, Masashi Kawasaki1,2, and Yoshinori Tokura1,2

  • 1Cross-Correlated Materials Research Group (CMRG) and Correlated Electron Research Group (CERG), Advanced Science Institute, RIKEN, Wako 351-0198, Japan
  • 2Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan

  • *masao.nakamura@riken.jp

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 86, Iss. 12 — 15 September 2012

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×