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

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

2007-09-05

arxiv.org/abs/0709.0709v1

Physics

Condensed Matter

Superconductivity

will appear in PRB

Scientific paper

10.1103/PhysRevB.76.094521

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.

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