Superconducting heterostructures: From antipinning to pinning potentials
We study vortex lattice dynamics in a heterostructure that combines two type-II superconductors: a niobium film and a dense triangular array of submicrometric vanadium (V) pillars. Magnetic ac susceptibility measurements reveal a sudden increase in ac penetration, related to an increase in vortex mo...
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todo:paper_09532048_v27_n8_p_Carreira2023-10-03T15:50:49Z Superconducting heterostructures: From antipinning to pinning potentials Carreira, S.J. Chiliotte, C. Bekeris, V. Rosen, Y.J. Monton, C. Schuller, I.K. heterostructure superconductor type II Crystal lattices Heterojunctions Magnetic susceptibility Solids Superconducting films Superconducting materials Vortex flow Ac-susceptibility measurements heterostructure Superconducting transitions Temperature independents Type II Type II superconductors Vortex configurations Vortex lattice dynamics Superconductivity We study vortex lattice dynamics in a heterostructure that combines two type-II superconductors: a niobium film and a dense triangular array of submicrometric vanadium (V) pillars. Magnetic ac susceptibility measurements reveal a sudden increase in ac penetration, related to an increase in vortex mobility above a magnetic field H* (T), that decreases linearly with temperature. Additionally, temperature independent matching effects that occur when the number of vortices in the sample is an integer of the number of V pillars, strongly reduce vortex mobility, and were observed for the first and second matching fields, Hand H The angular dependence of H Hnd H* (T) shows that matching is determined by the normal applied field component, while H* (T) is independent of the applied field orientation. This important result identifies H* (T) with the critical field boundary for the normal to superconducting transition of V pillars. Below H* (T) superconducting V pillars repel vortices, and the array becomes an 'antipinning' landscape that is more effective in reducing vortex mobility than the 'pinning' landscape of the normal V sites above . Matching effects are observed both below and above H* (T) implying the presence of ordered vortex configurations for 'antipinning' or 'pinning' arrays. © 2014 IOP Publishing Ltd. Fil:Bekeris, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09532048_v27_n8_p_Carreira |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
heterostructure superconductor type II Crystal lattices Heterojunctions Magnetic susceptibility Solids Superconducting films Superconducting materials Vortex flow Ac-susceptibility measurements heterostructure Superconducting transitions Temperature independents Type II Type II superconductors Vortex configurations Vortex lattice dynamics Superconductivity |
| spellingShingle |
heterostructure superconductor type II Crystal lattices Heterojunctions Magnetic susceptibility Solids Superconducting films Superconducting materials Vortex flow Ac-susceptibility measurements heterostructure Superconducting transitions Temperature independents Type II Type II superconductors Vortex configurations Vortex lattice dynamics Superconductivity Carreira, S.J. Chiliotte, C. Bekeris, V. Rosen, Y.J. Monton, C. Schuller, I.K. Superconducting heterostructures: From antipinning to pinning potentials |
| topic_facet |
heterostructure superconductor type II Crystal lattices Heterojunctions Magnetic susceptibility Solids Superconducting films Superconducting materials Vortex flow Ac-susceptibility measurements heterostructure Superconducting transitions Temperature independents Type II Type II superconductors Vortex configurations Vortex lattice dynamics Superconductivity |
| description |
We study vortex lattice dynamics in a heterostructure that combines two type-II superconductors: a niobium film and a dense triangular array of submicrometric vanadium (V) pillars. Magnetic ac susceptibility measurements reveal a sudden increase in ac penetration, related to an increase in vortex mobility above a magnetic field H* (T), that decreases linearly with temperature. Additionally, temperature independent matching effects that occur when the number of vortices in the sample is an integer of the number of V pillars, strongly reduce vortex mobility, and were observed for the first and second matching fields, Hand H The angular dependence of H Hnd H* (T) shows that matching is determined by the normal applied field component, while H* (T) is independent of the applied field orientation. This important result identifies H* (T) with the critical field boundary for the normal to superconducting transition of V pillars. Below H* (T) superconducting V pillars repel vortices, and the array becomes an 'antipinning' landscape that is more effective in reducing vortex mobility than the 'pinning' landscape of the normal V sites above . Matching effects are observed both below and above H* (T) implying the presence of ordered vortex configurations for 'antipinning' or 'pinning' arrays. © 2014 IOP Publishing Ltd. |
| format |
JOUR |
| author |
Carreira, S.J. Chiliotte, C. Bekeris, V. Rosen, Y.J. Monton, C. Schuller, I.K. |
| author_facet |
Carreira, S.J. Chiliotte, C. Bekeris, V. Rosen, Y.J. Monton, C. Schuller, I.K. |
| author_sort |
Carreira, S.J. |
| title |
Superconducting heterostructures: From antipinning to pinning potentials |
| title_short |
Superconducting heterostructures: From antipinning to pinning potentials |
| title_full |
Superconducting heterostructures: From antipinning to pinning potentials |
| title_fullStr |
Superconducting heterostructures: From antipinning to pinning potentials |
| title_full_unstemmed |
Superconducting heterostructures: From antipinning to pinning potentials |
| title_sort |
superconducting heterostructures: from antipinning to pinning potentials |
| url |
http://hdl.handle.net/20.500.12110/paper_09532048_v27_n8_p_Carreira |
| work_keys_str_mv |
AT carreirasj superconductingheterostructuresfromantipinningtopinningpotentials AT chiliottec superconductingheterostructuresfromantipinningtopinningpotentials AT bekerisv superconductingheterostructuresfromantipinningtopinningpotentials AT rosenyj superconductingheterostructuresfromantipinningtopinningpotentials AT montonc superconductingheterostructuresfromantipinningtopinningpotentials AT schullerik superconductingheterostructuresfromantipinningtopinningpotentials |
| _version_ |
1782023788109496320 |