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: Experiment and theory
T2  - Phys. Rev. B
JO  - Phys. Rev. B
SP  - 094521 (1 to 5)
VL  - 76
IS  - 9
KW  - uasi-two-dimensional superconductors
KW  - NbN
AB  - We investigate competition between one- and two-dimensional topological excitations—phase slips and vortices—in the formation of resistive states in quasi-two-dimensional superconductors in a wide temperature range below the mean-field transition temperature TC0. The widths w=100nm of our ultrathin NbN samples are substantially larger than the Ginzburg-Landau coherence length ξ=4nm, and the fluctuation resistivity above TC0 has a two-dimensional character. However, our data show that the resistivity below TC0 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 and/or temperature variations. Measuring the resistivity within 7 orders of magnitude, we find that the quantum phase slips can only be essential below this level.
SN  - 1098-0121
UR  - https://link.aps.org/doi/10.1103/PhysRevB.76.094521
UR  - https://doi.org/10.1103/PhysRevB.76.094521
DO  - 10.1103/PhysRevB.76.094521
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1423), last updated on Sun, 16 May 2021 12:32:55 -0500
ID  - Bell_etal2007
ER  -