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Third-harmonic generation (35 GHz) at the surface of a superconductor was investigated. The observed periodic modulation of third-harmonic power with applied dc field implies a fluxquantization dependence which is not contained in the Entin-Wohlman theory of the intrinsic nonlinear response. We propose that self-formed superconducting quantum-interference device (SQUID) structures on the surface are the dominant nonlinearity for our samples. Computer simulation of a SQUID model reveals a striking similarity to the dc field, input power, and temperature dependence of the observed third-harmonic fields.
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Wilfley et al. (1984) studied this question.
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