Charge Disproportionation for Trimerization and Tetramerization in Spinel-Type AlV2O4

The electronic structure of spinel-type AlV2O4 is investigated using bulk-sensitive hard x-ray photoemission spectroscopy (HAXPES). The main and shoulder peaks of the V 2p3/2 core-level HAXPES spectra indicate charge disproportionation between V2+ and V3+, consistent with the average V valence of +2...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2024-07, Vol.93 (7), p.1
Main Authors: Okawa, Mario, Shimoyama, Ryota, Takayanagi, Ryohei, Yasui, Akira, Ikenaga, Eiji, Katsufuji, Takuro, Saitoh, Tomohiko, Mizokawa, Takashi
Format: Article
Language:eng ; jpn
Subjects:
Disproportionation
Electronic structure
Photoelectric emission
Pyrochlores
Spinel
Trimers
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Summary:The electronic structure of spinel-type AlV2O4 is investigated using bulk-sensitive hard x-ray photoemission spectroscopy (HAXPES). The main and shoulder peaks of the V 2p3/2 core-level HAXPES spectra indicate charge disproportionation between V2+ and V3+, consistent with the average V valence of +2.5. The estimated V2+/V3+ ratio is compatible with the formation of V trimers and tetramers in AlV2O4, providing a hint to develop a model for charge and orbital orderings in the V pyrochlore lattice. We propose that V2+ tetramers and V3+ trimers on the pyrochlore lattice are naturally explained by an orbitally induced Peierls mechanism.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.93.074709