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

X. S. Ling; M. J. Higgins; Chao Tang; P. M. Chaikin; S. Bhattacharya; H. J. Lezec; J. S. Tsai; J. Fujita; H. Numata; Y. Nakamura; Y. Ochiai

doi:10.1103/physrevlett.76.2989

arXiv · cond-mat/9512036

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

X. S. Ling·M. J. Higgins·Chao Tang·P. M. Chaikin·S. Bhattacharya·H. J. Lezec·J. S. Tsai·J. Fujita·H. Numata·Y. Nakamura·Y. Ochiai

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Abstract

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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X. S. Ling, M. J. Higgins, Chao Tang, P. M. Chaikin, S. Bhattacharya, H. J. Lezec, J. S. Tsai, J. Fujita, H. Numata, Y. Nakamura, Y. Ochiai. 1995-12-06. Nature of Phase Transitions of Superconducting Wire Networks in a Magnetic Field. https://doi.org/10.1103/physrevlett.76.2989

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