Disappearance of superconductivity and critical resistance in thin indium films

In thin granular films composed of two-dimensionally coupled indium particles, we have studied influences of average particle sizes anti d on the superconducting transition. For films with anti d=280A and 224A, superconducting transition temperature stays almost constant with increasing the sheet resistance Rn in the normal state, while for a film with anti d=140A, it decreases linearly with Rn. This means that the system changes to a dirty superconductor by reducing anti d. With further increasing Rn, superconductivity disappears when Rn exceeds the value Rc of order h/4e2, which seems to correlate with anti d. (orig.)