Abrikosov vortex corrections to effective magnetic field enhancement in epitaxial graphene

Autor:	Paola Barbara, I-Fan Hu, Joseph A. Hagmann, Heather M. Hill, Randolph E. Elmquist, Chieh-I Liu, Chi-Te Liang, David B. Newell, Albert F. Rigosi, Luke St. Marie, Dipanjan Saha
Rok vydání:	2021
Předmět:	Superconductivity Abrikosov vortex Hysteresis Materials science Condensed matter physics Meissner effect Condensed Matter::Superconductivity Magnet London penetration depth Magnetic field Vortex
Zdroj:	Physical Review B. 104
ISSN:	2469-9969 2469-9950
Popis:	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 $(l1\mathrm{T})$ 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::67c2955f15c41b1a507c273dc8cad8f2 https://doi.org/10.1103/physrevb.104.085435 Zobrazit plný text záznamu