Abstract
Abstract The superconducting phase boundary TC(H) in a mesoscopic loop reveals the presence of ordinary Little-Parks oscillations as well as an anomalous field enhancement of the superconducting transition temperature Tc for low flux quanta. The amplitude of the Tc enhancement depends on the current through the loop imposed by the external current source. For high currents, exceeding a critical value, a crossover to a TC(H) boundary without any Little-Parks oscillations is observed.
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