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Microscopic Theory of Thermal Phase Slips in Clean Narrow Superconducting Wires A. Zharov, A. Lopatin, A. E. Koshelev, and V. M. Vinokur
 

Summary: Microscopic Theory of Thermal Phase Slips in Clean Narrow Superconducting Wires
A. Zharov, A. Lopatin, A. E. Koshelev, and V. M. Vinokur
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
(Received 2 November 2006; published 11 May 2007)
We consider the structure of a thermal phase-slip center for a simple microscopic model of a clean one-
dimensional superconductor in which superconductivity occurs only within one conducting channel or
several identical channels. Surprisingly, the Eilenberger equations describing the saddle-point configu-
ration allow for an exact analytical solution in the whole temperature and current range. This solution
allows us to derive a closed expression for the free-energy barrier, which we use to compute its
temperature and current dependences.
DOI: 10.1103/PhysRevLett.98.197005 PACS numbers: 74.78.Na, 74.20.Fg, 74.40.+k
Recent advance in fabrication techniques have brought
ultrathin superconductor wires into active experimental
investigation (for example, [14]), as they may play an
important role in future electronics. These studies brought
about the fundamental question of the limits at which thin
wires retain a key property of superconductors: the ability
to carry currents without dissipation. It was well estab-
lished that in extremely narrow superconductors thermal
fluctuations can occasionally drive a small part of the wire

  

Source: Alexei, Koshelev - Materials Science Division, Argonne National Laboratory

 

Collections: Materials Science; Physics