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 q0 = (0,0.305,0) emerges below 220 K in β′-Cu0.29V 2O5. For β′-Cu0.39V 2O5, 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 q2 = (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 q2 modulations was also observed. It seems that the q2 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.
- Low-dimensional conductor
- Modulated structure
- Vanadium bronze
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering