Quantum fluctuations in ultranarrow superconducting aluminum nanowires
M. Zgirski, K.-P. Riikonen, V. Touboltsev, K. Yu. Arutyunov
DOI 10.1103/PhysRevB.77.054508 · Physical Review B
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Abstract
Progressive reduction of the effective diameter of a nanowire is applied to trace evolution of the shape of the superconducting transition R(T) in quasi-one-dimensional aluminum structures. In nanowires with effective diameter ⩽15nm 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 thinnest samples. Experimental results are in reasonable agreement with existing theoretical models. The effect should have a universal validity, indicating a breakdown of the zero-resistance state in a superconductor below a certain scale.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure unresolved | onset |
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | Pressure not reported | onset |
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