Abstract

The influence of a magnetic field on microwave photon-assisted quasiparticle tunnelling has been studied experimentally. The experimental results for a superconducting tin-oxide-tin tunnelling junction are analysed. It is realised that for sufficiently high magnetic field, quantum effects in the tunnel characteristic phase out. Instead, the junction behaviour becomes like that of a classical RF energy detector. These results are found to be in good agreement with the Tien-Gordon theory (1963) as modified by Hamilton and Shapiro (1970) and the Abrikosov-Gor'kov theory (1960).

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