The superconducting critical fields H(c2) of a some diamond-like films
incorporating tungsten (WxC1-xSi, 0.22 < x < 0.28) having critical te
mperatures between 2 and 4 K have been determined from resistivity mea
surements. For the field perpendicular to the film H(c2) increases con
tinuously as the temperature is decreased. At the lowest temperatures,
the critical fields are greater than those expected for a normal type
II superconductor. The probable origin of this effect lies in the amo
rphous nature of the films.