Abstract
Abstract High resolution X-ray study reveals the wave vector change in the modulated structure of the quasi-one-dimensional compound β′-Cu vanadium bronze. Structural modulation of the reduced wave vector q 0 =(0,0.305,0) emerges below 220 K in β′-Cu0.29V2O5. For β′-Cu0.39V2O5, not the single q modulation but two kinds of modulations were observed. A three-fold superlattice structure with q 1 =(0,0.333,0) appears below 210 K . An incommensurate modulated structure with q 2 =(0,0.26–0.29, 0) coexists below 175 K , whose satellite intensity and b ∗ component Qb have temperature and passing-time dependencies between 140 and 175 K . The competition between q 1 and q 2 modulations was also observed. It seems that the q 2 is deeply related to the physical property change between 140 and 180 K confirmed by the decrease in the magnetic susceptibility and the increase in the resistivity.
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