Spin-Singlet Clusters in the Ladder CompoundNaV2O5

2000/04/24 by J. L. de Boer, Auke Meetsma, G. Maris +4 · 5 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Transition Metal Oxide Nanomaterials #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.84.3962

openalex publication_date 2000/04/24 · arxiv created 2000/08/03 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01

Abstract

The space group of \ensuremathα^\ensuremath'\ensuremath-NaV₂O₅ turns below T_c\phantom\rule0ex0ex=\phantom\rule0ex0ex34K from Pmmn with all V sites equivalent, into Fmm2 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⁺, V^4.5+, 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.

Cited by

• Test of the frustrated spin-cluster model to describe the low-temperature physics ofNaV2O5
• Temperature dependence of optical spectral weights in quarter-filled ladder systems
• Low-Temperature Structure of the Quarter-Filled Ladder Compound α'-NaV2O5
• Modeling the Electronic Behavior ofγ−LiV2O5: A Microscopic Study
• “Devil’s Staircase”-Type Phase Transition inNaV2O5under High Pressure