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Magnetic properties of pure and surface treated Vanadium

The very high surface pinning present in superconductors strongly hinders the analysis of fission fragment irradiation experiments which produce heavy damage in a surface layer of approximately 10 μm. In order to decrease this pinning effect, different treatments such as coating with a normal metal or oxygen diffusion can be used. In this paper we show that oxygen doping lowers the critical temperature T c of Vanadium and surface oxidation reduces drastically the irreversibility of magnetization curves. We show that the dependence of T c on the oxygen concentration combined with the measurement of the oxygen concentration gradient (obeying Fick's diffusion law) can explain our magnetic permeability data.