Negative nonlocal and local voltages (resistances) in a quasi-one-dimensional superconducting aluminum structure

V. I. Kuznetsov; O. V. Trofimov

doi:10.1016/j.physc.2020.1353811

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arXiv · 2604.26814

Negative nonlocal and local voltages (resistances) in a quasi-one-dimensional superconducting aluminum structure

V. I. Kuznetsov·O. V. Trofimov

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Abstract

To study a nonlocal electron transport in an aluminum superconducting quasi-one-dimensional structure, we measured negative nonlocal (local) direct current voltages in the structure in a magnetic field near the critical temperature. The structure is a normal-superconducting at $T_{cn}<T<T_{cw}$ ($T_{cn}$ and $T_{cw}$ are the critical temperatures for narrow and wide wires, respectively, making up this structure). Negative voltage arises due to a quasiparticle current flowing through the N-S interface. We plotted the experimental and theoretical temperature and magnetic-field dependences of current, resistance and voltage corresponding to the peak of negative voltage, taking into account either equilibrium or nonequilibrium superconducting fluctuations.

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V. I. Kuznetsov, O. V. Trofimov. 2026-04-29. Negative nonlocal and local voltages (resistances) in a quasi-one-dimensional superconducting aluminum structure. https://doi.org/10.1016/j.physc.2020.1353811

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