Local spin and charge properties of beta-Ag0.33V2O5 studied by 51V NMR

Abstract

Local spin and charge properties were studied on beta-Ag0.33V2O5, a pressure-induced superconductor, at ambient pressure using 51V-NMR and zero-field-resonance (ZFR) techniques. Three inequivalent Vi sites (i=1, 2, and 3) were identified from 51V-NMR spectra and the principal axes of the electric-field-gradient (EFG) tensor were determined in a metallic phase and the following charge-ordering phase. We found from the EFG analysis that the V1 sites are in a similar local environment to the V3 sites. This was also observed in ZFR spectra as pairs of signals closely located with each other. These results are well explained by a charge-sharing model where a 3d1 electron is shared within a rung in both V1-V3 and V2-V2 two-leg ladders.

arXiv comment12pages, 16figures

References in corpus (5)

• Superconductivity mediated by charge fluctuations in layered molecular crystals
• Leading interactions in the $\beta$-$Sr{V}_6{O}_{15}$ compound
• Critical Properties of One-Dimensional Electron Systems with $1/r^{\alpha }$-type Long-Range Interactions
• Crystal structure and charge order below the metal-insulator transition in the vanadium bronze $\beta$-SrV${}_6$O${}_{15}$
• Site-Selective NMR in the Quasi-1D Conductor beta-Sr0.33V2O5