| Abstract
| - Scanning tunneling spectroscopy along with magnetization measurements were employed in the study of $\chem{Na}$-doped $\chem{WO_3}$. The magnetization data suggest that a superconducting phase is formed below $T_\ab{C} = 91$ K. Tunneling experiments reveal islands, 20-150 nm in size, having a superconductor-like density of states. These islands cover about 10% of the surface, the rest of which is insulating, and exhibit spectroscopic gaps having values up to $2 \Delta /kT_\ab{C} \sim 4$. Therefore this material seems to be a non-cuprate superconductor with a high critical temperature.
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