The fluxoid quantization condition for a thin superconducting cylinder causes a change in the order parameter to result in a change in the frozen-in magnetic flux. By measuring with a SQUID the change in magnetic flux for a superconducting aluminum cylinder under microwave irradiation it is found that the order parameter increases as a function of the microwave power. Order-parameter changes with changing temperature are observed also, and they are in agreement with theoretical expectations for a dirty superconductor.
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Pals et al. (1980) studied this question.
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