TY  - JOUR
AU  - Bell, M.
AU  - Sergeev, A.
AU  - Mitin, V.
AU  - Bird, J.
AU  - Verevkin, A.
AU  - Gol'tsman, G.
PY  - 2007
DA  - 2007//
TI  - One-dimensional resistive states in quasi-two-dimensional superconductors
JO  - arXiv:0709.0709v1 [cond-mat.supr-con]
SP  - 1
EP  - 11
AB  - 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 ξ = 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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ID  - Bell_etal2007
ER  -