Critical current and electric transport properties of superconducting epitaxial Nb(Ti)N submicron structures

A. Klimov; W. Słysz; M. Guziewicz; V. Kolkovsky; M. Węgrzecki; J. Bar; M. Marchewka; B. Seredyński

doi:10.1117/12.2258216

22 December 2016 Critical current and electric transport properties of superconducting epitaxial Nb(Ti)N submicron structures

A. Klimov, W. Słysz, M. Guziewicz, V. Kolkovsky, M. Węgrzecki, J. Bar, M. Marchewka, B. Seredyński

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Proceedings Volume 10175, Electron Technology Conference 2016; 101750R (2016) https://doi.org/10.1117/12.2258216
Event: Electron Technology Conference ELTE 2016, 2016, Wisla, Poland

Abstract

Critical current and current-voltage characteristics of epitaxial Nb(Ti)N submicron ultrathin structures were measured as function of temperature. For 700-nm-wide bridge we found current-driven vortex de-pinning at low temperatures and thermally activated flux flow closer to the transition temperature, as the limiting factors for the critical current density. For 100-nm-wide meander we observed combination of phase-slip activation and vortex-anti-vortex pair (VAP) thermal excitation. Our Nb(Ti)N meander structure demonstrates high de-pairing critical current densities ~10⁷ A/cm² at low temperatures, but the critical currents are much smaller due to presence of the local constrictions.

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A. Klimov, W. Słysz, M. Guziewicz, V. Kolkovsky, M. Węgrzecki, J. Bar, M. Marchewka, and B. Seredyński "Critical current and electric transport properties of superconducting epitaxial Nb(Ti)N submicron structures", Proc. SPIE 10175, Electron Technology Conference 2016, 101750R (22 December 2016); https://doi.org/10.1117/12.2258216

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