The ESR of Mo5+ sites at defects in Rb0.3MoO3 and K0.3MoO3 was investigated between 4.2 and 53 K. The spectra reflect the modulation of the g tensor by the periodic lattice distortion coupled to the charge-density wave (CDW). We find (i) the CDW is not pinned strongly to the defects, despite their charge and (ii) lowering the temperature, the CDW becomes gradually commensurate with the lattice. The incommensurate-to-commensurate transition is not complete, however, even at 4.2 K.
ASJC Scopus subject areas
- Condensed Matter Physics