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Charge Order Driven spin-Peierls Transition in NaV2O5 | | Y. Fagot-Revurat
; M.Mehring
; R.K. Kremer
; | | Date: |
21 Jul 1999 | | Subject: | Strongly Correlated Electrons; Materials Science | cond-mat.str-el cond-mat.mtrl-sci | | Affiliation: | 2 Physikalisches Institut Stuttgart, Max-Planck Institut Stuttgart | | 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. | | Source: | arXiv, cond-mat/9907326 | | Services: | Forum | Review | PDF | Favorites | |
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