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The superconductive properties and structure of vacuum-deposited tin films

The effect of oxygen, present during film formation, on the structure and superconducting properties of tin films vacuum deposited on glass has been studied for substrate temperatures during deposition in the ranges of 23-30°C and 63-91°C. In both temperature ranges, in general, an increase in oxygen pressure decreases crystallite size and electron mean free path; it increases superconducting critical magnetic field value and width of transition but decreases the superconducting temperature transition width. The higher substrate temperatures produce films with larger crystallites and thin intercrystalline regions; these show hysteresis in the superconducting magnetic field transition and have higher values of critical field and critical current, in excess of those theoretically predicted.