Superconductivity in Tungsten-Carbide Nanowires Deposited from the Mixtures of W(CO)₆and C₁₄H₁₀

Tungsten-carbide (W-C) nanowires have been deposited by focused-ion-beam chemical vapor deposition (FIB-CVD). Mixtures of C 14 H 10 and W(CO) 6 are used as precursors. For certain precursor ratios, our nanowires become superconducting with a T c as high as 5.8 K. Also, freestanding W-C nano pillars were grown by FIB-CVD. The growth rate of the deposition from the mixture is at most 4.25 times higher than W(CO) 6 is used as the precursor. This growth rate greatly facilitates the fabrication of three-dimensional superconducting structures.