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Regular version of the site

Article

Quantum phase slip phenomenon in ultra-narrow superconducting nanorings

Scientific Reports. 2012. Vol. 2. No. 293. P. 1-7.
Konstantin Yu. Arutyunov, Hongisto T. T., Lehtinen J. S., Leino L. I., Vasiliev A. L.

The smaller the system, typically - the higher is the impact of fluctuations. In narrow superconducting wires
sufficiently close to the critical temperature Tc thermal fluctuations are responsible for the experimentally
observable finite resistance. Quite recently it became possible to fabricate sub-10 nm superconducting
structures, where the finite resistivity was reported within the whole range of experimentally obtainable
temperatures. The observation has been associated with quantum fluctuations capable to quench zero
resistivity in superconducting nanowires even at temperatures T-->0. Here we demonstrate that in tiny
superconducting nanorings the same phenomenon is responsible for suppression of another basic attribute
of superconductivity - persistent currents - dramatically affecting their magnitude, the period and the shape
of the current-phase relation. The effect is of fundamental importance demonstrating the impact of
quantum fluctuations on the ground state of a macroscopically coherent system, and should be taken into
consideration in various nanoelectronic applications