Quantum fluctuations in ultranarrow superconducting nanowires

Details Quantum fluctuations in ultranarrow superconducting nanowires Quantum fluctuations in ultranarrow superconducting nanowires

2008-01-16

arxiv.org/abs/0801.2516v1

Phys. Rev. B. 77, 054508 (2008)

Physics

Condensed Matter

Superconductivity

18 pages, 5 figures

Scientific paper

10.1103/PhysRevB.77.054508

Progressive reduction of the effective diameter of a nanowire is applied to trace evolution of the shape of superconducting transition $R(T)$ in quasi-one-dimensional aluminum structures. In nanowires with effective diameter $\leq$ 15 nm the $R(T)$ dependences are much wider than predicted by the model of thermally activated phase slips. The effect can be explained by quantum fluctuations of the order parameter. Negative magnetoresistance is observed in the thinest samples. Experimental results are in reasonable agreement with existing theoretical models. The effect should have a universal validity indicating a breakdown of zero resistance state in a superconductor below a certain scale.

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