Physics – Condensed Matter – Superconductivity
Scientific paper
2005-05-31
Phys. Rev. Lett 97, 017001 (2006)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, submitted to Phys. Rev. Lett. Manuscript, figure and EPAPS have been revised to streamline the presentatio
Scientific paper
10.1103/PhysRevLett.97.017001
Quantum phase slips have received much attention due to their relevance to superfluids in reduced dimensions and to models of cosmic string production in the Early Universe. Their establishment in one-dimensional superconductors has remained controversial. Here we study the nonlinear voltage-current characteristics and linear resistance in long superconducting Al wires with lateral dimensions $\sim$ 5 nm. We find that, in a magnetic field and at temperatures well below the superconducting transition, the observed behaviors can be described by the non-classical, macroscopic quantum tunneling of phase slips, and are inconsistent with the thermal-activation of phase slips.
Altomare Fabio
Chang Albert M.
Hong Yuguang
Melloch Michael R.
Tu Charles W.
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