Electronic structure and transport properties of K-doped blue bronze Rb_(0.15)K_(0.15)MoO_3

摘要

Single crystals of K-doped blue bronze Rb_(0.15)K_(0.15)MoO_3 and Rb_(0.3)MoO_3 have been investigated by measurements of the X-ray photoemission spectrum (XPS), electrical resistivity and thermoelectric power, respectively. Analysis of the XPS data reveals that two final states representing alternate screening channels coexist in Rb_(0.15)K_(0.15)MoO_3. Compared with the pure bronze, the Mo sites of the doped sample contain less 4d electrons which reflected in the movement of Mo3d spectrum. Due to the discrepancy of electronic structure, the K ion doping results in the notable increase of the single particle activation energy and decrease of the thermoelectric power in the charge density wave state.