Effect of sample geometry on the phase boundary of a mesoscopic superconducting loop

G. R. Berdiyorov, S. H. Yu, Z. L. Xiao, F. M. Peeters, J. Hua, A. Imre, and W. K. Kwok
Phys. Rev. B 80, 064511 – Published 17 August 2009

Abstract

We studied the effect of sample geometry on the evolution of the superconducting state in nanoscale Nb circular and square loops by transport measurements. A multistage resistive transition with temperature is found for both samples, which is related to the effect of contact leads made from the same superconducting material. The HT phase diagrams close to Tc0 show clear periodic oscillations on top of a parabolic background, i.e., Little-Parks effect. However, the amplitude of the oscillations decreases faster in the circular loop compared to the one in the square sample. Numerical simulations are conducted within the nonlinear Ginzburg-Landau theory to show the effect of sample geometry on the nucleation of superconductivity in superconducting loop structures.

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  • Received 18 May 2009

DOI:https://doi.org/10.1103/PhysRevB.80.064511

©2009 American Physical Society

Authors & Affiliations

G. R. Berdiyorov1,2, S. H. Yu2, Z. L. Xiao2,3,*, F. M. Peeters1,†, J. Hua2,3, A. Imre3,4, and W. K. Kwok3

  • 1Departement Fysica, Universiteit Antwerpen, Groenenborgerlaan 171, B-2020 Antwerpen, Belgium
  • 2Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA
  • 3Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 4Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA

  • *zxiao@niu.edu
  • francois.peeters@ua.ac.be

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Issue

Vol. 80, Iss. 6 — 1 August 2009

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