Charge order, orbital order, and electron localization in the Magnéli phase Ti4O7

V. Eyert*, Udo Schwingenschloegl, U. Eckern

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

The metal-insulator transition of the Magnéli phase Ti 4O7 is studied by means of augmented spherical wave (ASW) electronic structure calculations as based on density functional theory and the local density approximation. The results show that the metal-insulator transition arises from a complex interplay of charge order, orbital order, and singlet formation of those Ti 3d states which mediate metal-metal bonding inside the four-atom chains characteristic of the material. Ti4O 7 thus combines important aspects of Fe3O4 and VO2. While the charge ordering closely resembles that observed at the Verwey transition, the orbital order and singlet formation appear to be identical to the mechanisms driving the metal-insulator transition of vanadium dioxide.

Original languageEnglish (US)
Pages (from-to)151-156
Number of pages6
JournalChemical Physics Letters
Volume390
Issue number1-3
DOIs
StatePublished - May 21 2004

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

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