Vortex crossing and trapping in doubly connected mesoscopic loops of a single-crystal type-II superconductor

Shaun A. Mills, Chenyi Shen, Zhuan Xu, Ying Liu

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Numerical calculations on a mesoscopic ring of a type-II superconductor in the London limit suggest that an Abrikosov vortex can be trapped in such a structure above a critical magnetic field and generate a phase shift in the magnetoresistance oscillations. We prepared submicron-sized superconducting loops of single-crystal, type-II superconductor NbSe2 and measured magnetoresistance oscillations resulting from vortices crossing the loops. The free-energy barrier for vortex crossing determines the crossing rate and is periodically modulated by the external magnetic flux threading the loop. We demonstrated experimentally that the crossing of vortices can be directed at a pair of constrictions in the loop, leading to more pronounced magnetoresistance oscillations than those in a uniform ring. The vortex trapping in both a simple ring and a ring featuring two constrictions was found to result in a phase shift in the magnetoresistance oscillations as predicted in the numerical calculations. The controlled crossing and trapping of vortices demonstrated in our NbSe2 devices provide a starting point for the manipulation of individual Abrikosov vortices, which is useful for future technologies.

Original languageEnglish (US)
Article number144502
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number14
DOIs
StatePublished - Oct 5 2015

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Superconducting materials
Vortex flow
trapping
Single crystals
vortices
Magnetoresistance
single crystals
oscillations
rings
Phase shift
constrictions
phase shift
Energy barriers
Magnetic flux
Free energy
magnetic flux
manipulators
free energy
Magnetic fields
magnetic fields

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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Vortex crossing and trapping in doubly connected mesoscopic loops of a single-crystal type-II superconductor. / Mills, Shaun A.; Shen, Chenyi; Xu, Zhuan; Liu, Ying.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 92, No. 14, 144502, 05.10.2015.

Research output: Contribution to journalArticle

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