Thermal transport properties and electronic structure of W-doped rubidium blue bronzes Rb0.3Mo1-xWxO3 (x=0, 0.001, 0.003, 0.005)

The thermoelectric power (TEP), electrical resistivity and X-ray photoemission spectrum (XPS) of the W-doped rubidium blue bronzes Rb0.3Mo1-xWxO3 (x=0, 0.001, 0.003, 0.005) were investigated. It is shown that the Peierls transition is suppressed with the increase in the concentrations of the doped W ions. The sign change of the TEP was observed for all the samples. At low temperature below the Peierls transition, the W-doping makes the obvious decrease in the absolute values of TEP, especially for Rb0.3Mo1-xWxO3 (x=0.003, 0.005). Furthermore, as compared with the pure blue bronzes, the enlarged difference between Peierls transition temperature (Tp) and the sign changed temperature (Ts) in Rb0.3Mo0.999W0.001O3 bronzes was observed and discussed in detail.