Upper Critical Field of a Percolating Superconductor

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Abstract
The upper critical field Hc2 of the random percolating superconductor InGe has been measured as a function of the metal volume fraction x. Near the percolation threshold xc, Hc2 diverges with a critical exponent which is significantly smaller than that of the normal-state resistivity. An interpretation of this behavior is proposed in terms of the properties of the infinite cluster.