Electronic structure of an antiferromagnetic metal: CaCrO3

P. A. Bhobe, A. Chainani, M. Taguchi, R. Eguchi, M. Matsunami, T. Ohtsuki, K. Ishizaka, M. Okawa, M. Oura, Y. Senba, H. Ohashi, M. Isobe, Y. Ueda, S. Shin

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Abstract

We report on the electronic structure of the perovskite oxide CaCrO 3 using valence-band, core-level, and Cr 2p-3d resonant photoemission spectroscopy (PES). Despite its antiferromagnetic order, a clear Fermi edge characteristic of a metal with dominant Cr 3d character is observed in the valence-band spectrum. The Cr 3d single-particle density of states are spread over 2 eV, with the photoemission spectral weight distributed in two peaks centered at ~1.2 and 0.2 eV below EF, suggestive of the coherent and incoherent states resulting from strong electron-electron correlations. Resonant PES across the Cr 2p-3d threshold identifies a "two-hole" correlation satellite and yields an on-site Coulomb energy U~ 4.8 eV. The metallic DOS at EF is also reflected through the presence of a well-screened feature at the low binding energy side of the Cr 2p core-level spectrum. X-ray-absorption spectroscopy at Cr L3,2 and O K edges exhibit small temperature-dependent changes that point toward a small change in Cr-O hybridization. The Cr 2p core-level spectrum can be reproduced using cluster model calculations that include a charge transfer from the metallic screening channel at EF. The overall results indicate that CaCrO3 is a strongly hybridized antiferromagnetic metal, lying in the regime intermediate to Mott-Hubbard and charge-transfer systems.

Original languageEnglish
Article number165132
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number16
DOIs
Publication statusPublished - Apr 29 2011
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Bhobe, P. A., Chainani, A., Taguchi, M., Eguchi, R., Matsunami, M., Ohtsuki, T., Ishizaka, K., Okawa, M., Oura, M., Senba, Y., Ohashi, H., Isobe, M., Ueda, Y., & Shin, S. (2011). Electronic structure of an antiferromagnetic metal: CaCrO3. Physical Review B - Condensed Matter and Materials Physics, 83(16), [165132]. https://doi.org/10.1103/PhysRevB.83.165132