Stimulation and enhancement of superconductivity by external electromagnetic radiation (review)

The results of experimental and theoretical investigations on the stimulation and enhancement of superconductivity by external electromagnetic radiation in narrow long [L > ξ (T)] and short [L < ξ (T)] specimens of Sn, In, and Al in a field of frequencies of 7 MHz to 150 GHz are given. The dependence of the effect on the size, material, and purity of the specimens is examined. The experimental results presented here as well as results obtained by other authors are shown to be in good agreement with the conclusions of the microscopic theories of Éliashberg and Aslamazov and Larkin.

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