Persistent three- and four-atom orbital molecules in the spinel AlV2O4

Alexander J. Browne, Simon A. J. Kimber, J. Paul Attfield*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Electronic instabilities in transition-metal compounds may lead to ground states containing orbital molecules when direct metal-metal orbital interactions occur. The spinel AlV2O4 was reported to contain V-7(17+) orbital heptamers that emerge below a 700 K charge ordering transition. Our x-ray total scattering analysis of AlV2O4 between 300 and 1100 K reveals a very different picture as the postulated heptamers are found to be pairs of spin-singlet V-3(9+) trimers and V-4(8+) tetramers, and these orbital molecules persist to at least 1100 K in a disordered high-temperature cubic phase.

Original languageEnglish
Article number052003
Number of pages5
JournalPhysical Review Materials
Volume1
Issue number5
Early online date31 Oct 2017
DOIs
Publication statusE-pub ahead of print - 31 Oct 2017

Keywords

  • TRANSITION
  • OXIDES

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