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Physical Review B
We present experimental results on the transport properties of a superconducting aluminum loop connected to reservoirs. As function of the applied magnetic field, an unexpected behavior is found-a steep enhancement ͑for temperatures close to the critical temperature͒ and a sharp drop ͑at lower temperatures͒ of the critical current at some value of the magnetic field B a * ͑T͒. These effects are a consequence of a sudden suppression of superconductivity at B a = B a * in the banks to which thedoi:10.1103/physrevb.76.134505 fatcat:bpaxg2wp7jhjbpqvrrqwxbbare