Flux penetration in a superconducting film partially capped with a conducting layer
| Autor: | W.A. Ortiz, Tom H. Johansen, Roman B. G. Kramer, Jacques Tempere, Joachim Fritzsche, O.-A. Adami, Ngoc Duy Nguyen, V. N. Gladilin, F. Colauto, J. T. Devreese, Alejandro Silhanek, V. V. Moshchalkov, Jérémy Brisbois, M. Motta |
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| Přispěvatelé: | Département de Physique, Université de Liège, INPAC–Institute for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism Group, K.U. Leuven, Catholic University of Leuven - Katholieke Universiteit Leuven (KU Leuven), Departement Fysica , Universiteit Antwerpen, Departamento de Fisica Universidade Federal de Sao Carlos, Universidade Federal de Sao Carlos, Department of Physics [Oslo], Faculty of Mathematics and Natural Sciences [Oslo], University of Oslo (UiO)-University of Oslo (UiO), Institute for Superconducting and Electronic Materials, University of Wollongong, Chalmers University of Technology, Department of Applied Physics, Division of Nuclear Engineering, SE-412 96 Göteborg, Sweden, Circuits électroniques quantiques Alpes (QuantECA ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Superconductivity Materials science Flux pinning Condensed matter physics Astrophysics::High Energy Astrophysical Phenomena Physics Thermomagnetic convection Penetration (firestop) Conductivity 01 natural sciences Magnetic flux [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con] Condensed Matter::Superconductivity 0103 physical sciences Thin film Perfect conductor 010306 general physics |
| Zdroj: | Physical review B Physical Review B Physical Review B, American Physical Society, 2017, 95 (9), pp.94506. ⟨10.1103/PhysRevB.95.094506⟩ |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/PhysRevB.95.094506⟩ |
| Popis: | International audience; The influence of a conducting layer on the magnetic flux penetration in a superconducting Nb film is studied by magneto-optical imaging. The metallic layer partially covering the superconductor provides an additional velocity-dependent damping mechanism for the flux motion that helps to protect the superconducting state when thermomagnetic instabilities develop. If the flux advances with a velocity slower than w = 2/μ 0 σ t, where σ is the cap layer conductivity and t is its thickness, the flux penetration remains unaffected, whereas for incoming flux moving faster than w, the metallic layer becomes an active screening shield. When the metallic layer is replaced by a perfect conductor, it is expected that the flux braking effect will occur for all flux velocities. We investigate this effect by studying Nb samples with a thickness step. Some of the observed features, namely the deflection of the flux trajectories at the border of the thick center, as well as the favored flux penetration at the indentation, are reproduced by time-dependent Ginzburg-Landau simulations. |
| Databáze: | OpenAIRE |
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