Charge Order Driven spin-Peierls Transition in NaV2O5
Strongly Correlated Electrons
2009-10-31 v1 Materials Science
Abstract
We conclude from 23Na and 51V NMR measurements in NaxV2O5(x=0.996) a charge ordering transition starting at T=37 K and preceding the lattice distortion and the formation of a spin gap Delta=106 K at Tc=34.7 K. Above Tc, only a single Na site is observed in agreement with the Pmmn space group of this first 1/4-filled ladder system. Below Tc=34.7 K, this line evolves into eight distinct 23Na quadrupolar split lines, which evidences a lattice distortion with, at least, a doubling of the unit cell in the (a,b) plane. A model for this unique transition implying both charge density wave and spin-Peierls order is discussed.
Keywords
Cite
@article{arxiv.cond-mat/9907326,
title = {Charge Order Driven spin-Peierls Transition in NaV2O5},
author = {Y. Fagot-Revurat and M. Mehring and R. K. Kremer},
journal= {arXiv preprint arXiv:cond-mat/9907326},
year = {2009}
}
Comments
4 pages, 3 figures, submitted to Phys. Rev. Lett