The effect of an external magnetic field on zero-field resonances is investigated analytically. A calculation shows that the even-mode current height falls smoothly to zero as the external field strength is increased to nΦ0/2, where n is any positive integer and Φ0 is the flux quantum. A much more detailed comparison of the experimental observations and the theoretical predictions than that of earlier studies is given. We also discuss the temperature dependence of the current singularities and the formation of current branches with respect to coupling strength γ in Fiske modes, a microwave-coupled resonance mode, and this zero-field case, and the spectrum of emission radiation of the zero-field resonant modes. A possible mechanism is proposed which differs from the conventional explanation for the zero-field resonances in terms of the vortex model suggested by Fulton and Dynes.
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Gou, YS., Chung, CS. & Chi Chow, T. Properties of zero-field resonant modes in josephson junctions. J Low Temp Phys 41, 583–593 (1980). https://doi.org/10.1007/BF00114366
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DOI: https://doi.org/10.1007/BF00114366