A NOTE ON SUPERCONDUCTING VANADIUM THIN FILMS

Abstract : The study of the properties of vanadium thin films has been extended. Two specimens gave quite different results in the resistance versus temperature behavior. One specimen, designated VB2, has a rather broad transition beginning at 3.18 K and continuing to zero resistance at 2.02 K. There is no discontinuous transition observed. The substrate was a glass micro slide. Another specimen, designated VB4, has a resist-ANCE VS TEMPERATURE CURVE WHICH SHOWS A TRANSITION BEGINNING AT 4.10 K and continuing to zero resistance at 3.66 K. The transition is much sharper than in sample VB2. The film VB4 was of the same dimensions as VB2. The substrate of VB4 was quartz. The ratio of resistance at 4.2 K and at 295 K was 0.30 for the latter specimen and 0.53 for the former. Mechanically the films are very tough. The adherence of the vanadium films is extraordinary, there being no visible film damage after drawing a steel scriber across the film. (Author)