Abstract
The full temperature dependence of the electric field gradient tensor at the Na sites has been determined by nuclear magnetic resonance (NMR) in the temperature range 8–330 K in α-Nax 2O5 (x = 0.996). Above the spin-Peierls transition (T c = 34.7 K), only a single Na site is observed in agreement with the Pmmn space group proposed to describe this compound as the first example of a 1/4-filled ladder system. Below Tc, eight distinct quadrupolar23Na sites are observed according to the distortion wave vector kc = (1/2, 1/2, 1/4) previously reported. In addition, the opening of a spin gap is evidenced by a rapid drop of the magnetic hyperfine shift23K at Tc. The results are discussed in the context of a charge-order-driven spin-Peierls transition.
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Fagot-Revurat, Y., Bourdon, X., Mehring, M. et al. 23Na nuclear magnetic resonance investigation of the lattice distortion in α-NaxV2O5. Appl. Magn. Reson. 19, 363–372 (2000). https://doi.org/10.1007/BF03162378
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DOI: https://doi.org/10.1007/BF03162378