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Two-dimensional charge fluctuation in $$beta$$-Na$$_{0.33}$$V$$_{2}$$O$$_{5}$$

Owada, Kenji; Yamauchi, Toru*; Fujii, Yasuhiko*; Ueda, Yutaka*

We have investigated the critical phenomena of the metal-to-insulator (MI) transition of $$beta$$-Na$$_{0.33}$$V$$_{2}$$O$$_{5}$$. The critical exponent $$beta$$ of 0.226(3) and anisotropic diffuse scattering suggest that the MI transition of $$beta$$-Na$$_{0.33}$$V$$_{2}$$O$$_{5}$$ is two-dimensional in nature and that the dimension of the order parameter is not Ising. The non-Ising-like order parameter indicates that the MI transition is not a simple order-disorder type such as that of $$alpha$$'-NaV$$_{2}$$O$$_{5}$$ but charge-density-wave-like, where the valence at each V site is continuous and the arrangement is modulated. This closely corresponds to the situation predicted by neutron diffraction measurements and NMR measurements.

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Category:Materials Science, Multidisciplinary

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