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Thermoelectric Effect in Two-Band Single-Junction Superconducting Rings

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Abstract

Based on Ginzburg-Landau theory, we study the thermoelectric effect of two-band superconducting ring of inductance L with a microbridge structure. The phase difference of two order parameters in the ring satisfies the sine-Gordon equation, and from its soliton solution and the Josephson current-phase relation in the two-band microbridge, we obtain the analytical expression of the generated magnetic flux as a function of applied temperature gradient. Our results show that in the regime LIc > Φ0/2π with Ic the critical supercurrent in the microbridge and Φ0 = h/2e, this single-junction system will exhibit the irreversible behavior and the induced fractional flux transition can be easily observed in the typical two-band superconductor MgB2.

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Authors and Affiliations

  1. Department of Mathematics and Physics, North China Electric Power University, Beijing, 102206, China

    H. Huang, F. Shi & J.-J. Zhang

  2. State Key Laboratory for Mesoscopic Physics, Peking University, Beijing, 100871, China

    H. Huang

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  1. H. Huang
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Huang, H., Shi, F. & Zhang, JJ. Thermoelectric Effect in Two-Band Single-Junction Superconducting Rings. J Supercond Nov Magn 33, 361–366 (2020). https://doi.org/10.1007/s10948-019-05229-y

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