Co-O-O-Co superexchange pathways enhanced by small charge-transfer energy in multiferroic BiCoO3

T. Sudayama, Y. Wakisaka, Takashi Mizokawa, H. Wadati, G. A. Sawatzky, D. G. Hawthorn, T. Z. Regier, K. Oka, M. Azuma, Y. Shimakawa

Research output: Contribution to journalArticle

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Abstract

We have studied the electronic structure of multiferroic BiCoO3 using x-ray photoemission spectroscopy (XPS), x-ray absorption spectroscopy (XAS), and subsequent model calculations. The XAS results show that the Co3 + ion takes the high-spin d6 configuration which usually prefers G-type antiferromagnetic state. The XPS results and model Hartree-Fock calculations show that, in case of BiCoO3, small charge-transfer energy plays an essential role to enhance the Co-O-O-Co superexchange pathways. It is found that the combination of ferro-type orbital ordering of Co 3d t 2g and the Co-O-O-Co superexchange interaction gives rise to C-type antiferromagnetic state in BiCoO3. The present analysis suggests that, in addition to the Bi-O bonds responsible for the noncentrosymmetric deformation, the O-O bonds are important to stabilize the multiferroic phase of BiCoO3.

Original languageEnglish
Article number235105
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number23
DOIs
Publication statusPublished - 2011 Jun 3
Externally publishedYes

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x ray absorption
x ray spectroscopy
Charge transfer
absorption spectroscopy
photoelectric emission
charge transfer
X rays
Photoelectron spectroscopy
Absorption spectroscopy
spectroscopy
x rays
electronic structure
orbitals
energy
configurations
Electronic structure
ions
interactions
Ions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Co-O-O-Co superexchange pathways enhanced by small charge-transfer energy in multiferroic BiCoO3. / Sudayama, T.; Wakisaka, Y.; Mizokawa, Takashi; Wadati, H.; Sawatzky, G. A.; Hawthorn, D. G.; Regier, T. Z.; Oka, K.; Azuma, M.; Shimakawa, Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 83, No. 23, 235105, 03.06.2011.

Research output: Contribution to journalArticle

Sudayama, T, Wakisaka, Y, Mizokawa, T, Wadati, H, Sawatzky, GA, Hawthorn, DG, Regier, TZ, Oka, K, Azuma, M & Shimakawa, Y 2011, 'Co-O-O-Co superexchange pathways enhanced by small charge-transfer energy in multiferroic BiCoO3', Physical Review B - Condensed Matter and Materials Physics, vol. 83, no. 23, 235105. https://doi.org/10.1103/PhysRevB.83.235105
Sudayama, T. ; Wakisaka, Y. ; Mizokawa, Takashi ; Wadati, H. ; Sawatzky, G. A. ; Hawthorn, D. G. ; Regier, T. Z. ; Oka, K. ; Azuma, M. ; Shimakawa, Y. / Co-O-O-Co superexchange pathways enhanced by small charge-transfer energy in multiferroic BiCoO3. In: Physical Review B - Condensed Matter and Materials Physics. 2011 ; Vol. 83, No. 23.
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