We have investigated the critical phenomena of the metal-to-insulator (MI) transition of -NaVO. The critical exponent of 0.226(3) and anisotropic diffuse scattering suggest that the MI transition of -NaVO 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 '-NaVO 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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