Nature of Phase Transitions of Superconducting Wire Networks in a Magnetic Field

Details Nature of Phase Transitions of Superconducting Wire Networks in a Magnetic Field Nature of Phase Transitions of Superconducting Wire Networks in a Magnetic Field

1995-12-06

arxiv.org/abs/cond-mat/9512036v1

Phys. Rev. Lett. 76 (1996) 2989

Physics

Condensed Matter

5 pages, also available at http://www.neci.nj.nec.com/homepages/tang.html

Scientific paper

10.1103/PhysRevLett.76.2989

We study $I$-$V$ characteristics of periodic square Nb wire networks as a function of temperature in a transverse magnetic field, with a focus on three fillings 2/5, 1/2, and 0.618 that represent very different levels of incommensurability. For all three fillings, a scaling behavior of $I$-$V$ characteristics is found, suggesting a finite temperature continuous superconducting phase transition. The low-temperature $I$-$V$ characteristics are found to have an exponential form, indicative of the domain-wall excitations.

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