Spontaneous formation of vanadium "molecules" in a geometrically frustrated crystal: AlV2O4

Spontaneous formation of vanadium "molecules" in a geometrically frustrated crystal: AlV2O4

We investigated the charge-ordered (CO) state in spinel AlV2O4 by electron diffraction, synchrotron x-ray diffraction, and magnetic measurements. It was found that the CO structure appearing below 700 K is characterized by the formation of V clusters (heptamers), each of which is consisting of 7 van...

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Veröffentlicht in:Physical review letters 2006-03, Vol.96 (8), p.086406-086406
Hauptverfasser: Horibe, Y, Shingu, M, Kurushima, K, Ishibashi, H, Ikeda, N, Kato, K, Motome, Y, Furukawa, N, Mori, S, Katsufuji, T
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Sprache:eng
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Zusammenfassung:We investigated the charge-ordered (CO) state in spinel AlV2O4 by electron diffraction, synchrotron x-ray diffraction, and magnetic measurements. It was found that the CO structure appearing below 700 K is characterized by the formation of V clusters (heptamers), each of which is consisting of 7 vanadium atoms and is in a spin-singlet state as a total. Theoretical consideration indicates that this unique molecularlike V heptamer is stabilized by a strong bonding of vanadium t(2g) orbitals.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.96.086406