One-dimensional resistive states in quasi-two-dimensional superconductors

Abstract

We investigate competition between one- and two-dimensional topological excitations - phase slips and vortices - in formation of resistive states in quasi-two-dimensional superconductors in a wide temperature range below the mean-field transition temperature $T_{C0}$. The widths $w$ = 100 nm of our ultrathin NbN samples is substantially larger than the Ginzburg-Landau coherence length $\xi$ = 4nm and the fluctuation resistivity above $T_{C0}$ has a two-dimensional character. However, our data shows that the resistivity below $T_{C0}$ is produced by one-dimensional excitations, - thermally activated phase slip strips (PSSs) overlapping the sample cross-section. We also determine the scaling phase diagram, which shows that even in wider samples the PSS contribution dominates over vortices in a substantial region of current/temperature variations. Measuring the resistivity within seven orders of magnitude, we find that the quantum phase slips can only be essential below this level.

will appear in PRB

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• Evidence for Macroscopic Quantum Tunneling of Phase Slips in Long One-Dimensional Superconducting Al Wires
• Influence of high magnetic fields on superconducting transition of one-dimensional Nb and MoGe nanowires
• Fluctuation effects in superconducting nanostrips
• Quantum phase slips in the presence of finite-range disorder
• Operation of a superconducting nanowire quantum interference device with mesoscopic leads

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• Improved nanopatterning for YBCO nanowires approaching the depairing current
• Flux-charge duality and topological quantum phase fluctuations in quasi-one-dimensional superconductors
• Maximizing switching current of superconductor nanowires via improved impedance matching
• Quasi-1-Dimensional Superconductivity in Highly Disordered NbN Nanowires
• Superconducting detector of IR single-photons based on thin WSi films
• Accessing Phase Slip Events in Nb Meander Wires
• Sensing supercurrents using geometric effects
• Topological defects in superconducting open nanotubes under gradual and abrupt switch-on of the transport current and magnetic field