Anomalous behavior of transport properties near 60 K in tungsten-doped blue bronzes K0.3Mo1−xWxO3 (x=0–0.12)

Temperature dependences of thermoelectric power (TEP) and resistivity of a series of W-doped blue bronzes, K_0.3Mo_1−x W_xO₃ were presented. It was seen that the anomalous negative peak of the TEP near 60 K was greatly suppressed by the W-doping, while an anomaly of the resistivity near about 60 K appears and gradually strengthens with the doping. These results can be qualitatively explained by the change of the thermal excitation mechanism.