Spin-singlet clusters in the ladder compound NaV2O5

J.L. de Boer, A. Meetsma, J. Baas, T.T.M. Palstra*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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The space group of α′−NaV2O5 turns below Tc = 34K from Pmmn with all V sites equivalent, into Fmm 2 with three independent vanadium sites per layer. This is incompatible with models of charge ordering into V4+ and V5+. Our structure determination indicates that the phase transition consists of a charge ordering with three distinct valence states, formally V4+, V4.5+, and V5+. The singlet formation is not associated with dimerization on the spin ladder, but with the formation of spin clusters. Finally, we ascribe the quadrupling of the c axis to the large polarizability of the V2O5 skeleton.

Original languageEnglish
Pages (from-to)3962-3965
Number of pages4
JournalPhysical review letters
Issue number17
Publication statusPublished - 1 Jan 2000
Externally publishedYes

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