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Abrikosov vortex corrections to effective magnetic field enhancement in epitaxial graphene.


ABSTRACT: Here, we report the effects of enhanced magnetic fields resulting from type-II superconducting NbTiN slabs adjacent to narrow Hall bar devices fabricated from epitaxial graphene. Observed changes in the magnetoresistances were found to have minimal contributions from device inhomogeneities, magnet hysteresis, electron density variations along the devices, and transient phenomena. We hypothesize that Abrikosov vortices, present in type-II superconductors, contribute to these observations. By determining the London penetration depth, coupled with elements of Ginzburg-Landau theory, one can approximate an upper bound on the effect that vortex densities at low fields (< 1T) have on the reported observations. These analyses offer insights into device fabrication and how to utilize the Meissner effect for any low-field and low-temperature applications using superconductors.

SUBMITTER: Marie LRS 

PROVIDER: S-EPMC11177804 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature

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Abrikosov vortex corrections to effective magnetic field enhancement in epitaxial graphene.

Marie Luke R St LRS   Liu Chieh-I CI   Hu I-Fan IF   Hill Heather M HM   Saha Dipanjan D   Elmquist Randolph E RE   Lian Chi-Te CT   Newell David B DB   Barbara Paola P   Hagmann Joseph A JA   Rigosi Albert F AF  

Physical review. B 20210801 8


Here, we report the effects of enhanced magnetic fields resulting from type-II superconducting NbTiN slabs adjacent to narrow Hall bar devices fabricated from epitaxial graphene. Observed changes in the magnetoresistances were found to have minimal contributions from device inhomogeneities, magnet hysteresis, electron density variations along the devices, and transient phenomena. We hypothesize that Abrikosov vortices, present in type-II superconductors, contribute to these observations. By dete  ...[more]

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