We report resistivity and superconducting transition temperature measurements on ultrathin MoC films (down to 4.0 Å). We find that the critical sheet resistance separating the superconducting and insulating states at T=0 lies in the range 2.8–3.5 kΩ, which is about one-half of that reported for Bi films.

• Received 30 January 1990

DOI:https://doi.org/10.1103/PhysRevLett.64.3078