Normal and superconducting properties ofCsxWO3

The resistivity, Seebeck coefficient, superconducting transition temperature, and upper critical field have been measured in ${\mathrm{Cs}}_x\mathrm{W}{\mathrm{O}}_3$ for $0.19<~x<~0.30$. In contrast to ${\mathrm{Rb}}_x\mathrm{W}{\mathrm{O}}_3$, no temperature-dependent anomalies were observed in either the normal resistivity or the Seebeck coefficient. The superconducting transition temperature, $T_c$, increases monotonically with decreasing $x$ from 2 K at $x=0.30\mathrm{}$ up to 6.7 K at $x=0.20\mathrm{}$, with an inflection near 0.24. The resistivity as a function of $x$ increases monotonically with decreasing $x$ and also has an inflection near $x=0.24\mathrm{}$.