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Dependence of the magnitude and direction of the persistent current on the magnetic flux in superconducting rings

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Abstract

The obtained periodic magnetic-field dependences I c+(Φ/Φ0) and I c(Φ/Φ0) of the critical current measured in opposite directions on asymmetric superconducting aluminum rings has made it possible to explain previously observed quantum oscillations of dc voltage as a result of alternating current rectification. It was found that a higher rectification efficiency of both single rings and ring systems is caused by hysteresis of the current-voltage characteristics. The asymmetry of current-voltage characteristics providing the rectification effect is due to the relative shifts of the magnetic dependences I c(Φ/Φ0) = I c+(Φ/Φ0 + Δϕ) of the critical current measured in opposite directions. This shift means that the position of I c+(Φ/Φ0) and I c(Φ/Φ0) minima does not correspond to n + 0.5 magnetic flux Φ quanta, which is in direct contradiction to measured Little-Parks resistance oscillations. Despite this contradiction, the amplitude I c, an(Φ/Φ0) = I c+(Φ/Φ0) − I c(Φ/Φ0) of critical current anisotropy oscillations and its variations with temperature correspond to the expected amplitude of persistent current oscillations and its variations with temperature.

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Correspondence to A. V. Nikulov.

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Original Russian Text © V.L. Gurtovoi, S.V. Dubonos, A.V. Nikulov, N.N. Osipov, V.A. Tulin, 2007, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 132, No. 6, pp. 1320–1339.

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Gurtovoi, V.L., Dubonos, S.V., Nikulov, A.V. et al. Dependence of the magnitude and direction of the persistent current on the magnetic flux in superconducting rings. J. Exp. Theor. Phys. 105, 1157–1173 (2007). https://doi.org/10.1134/S1063776107120072

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  • DOI: https://doi.org/10.1134/S1063776107120072

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