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

Golibjon Berdiyorov, S. H. Yu, Z. L. Xiao, F. M. Peeters, J. Hua, A. Imre, W. K. Kwok

Research output: Contribution to journalArticle

17 Citations (Scopus)

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 H-T 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.

Original languageEnglish
Article number064511
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number6
DOIs
Publication statusPublished - 17 Aug 2009
Externally publishedYes

Fingerprint

Phase boundaries
Geometry
geometry
Superconductivity
Superconducting materials
Phase diagrams
Nucleation
oscillations
Computer simulation
superconductivity
phase diagrams
nucleation
Temperature
simulation
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Effect of sample geometry on the phase boundary of a mesoscopic superconducting loop. / Berdiyorov, Golibjon; Yu, S. H.; Xiao, Z. L.; Peeters, F. M.; Hua, J.; Imre, A.; Kwok, W. K.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 6, 064511, 17.08.2009.

Research output: Contribution to journalArticle

Berdiyorov, Golibjon ; Yu, S. H. ; Xiao, Z. L. ; Peeters, F. M. ; Hua, J. ; Imre, A. ; Kwok, W. K. / Effect of sample geometry on the phase boundary of a mesoscopic superconducting loop. In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 80, No. 6.
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