Charge Order Driven spin-Peierls Transition in NaV2O5

Details Charge Order Driven spin-Peierls Transition in NaV2O5 Charge Order Driven spin-Peierls Transition in NaV2O5

1999-07-21

arxiv.org/abs/cond-mat/9907326v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.84.4176

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.

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