75683 20190709135631.0 doi 10.1088/1361-6668/aa9244 sideral 104322 ART-2017-104322 eng Qureishy, T. Dendritic flux avalanches in a superconducting MgB2 tape 2017 Access copy available to the general public Unrestricted Tapes of MgB2 with high critical current have a significant technological potential, but can experience operational breakdown due to thermomagnetic instabilities. Such events are routinely registered by magnetisation measurements, but were never observed by direct imaging techniques. Here we report magneto-optical imaging visualisation of a tape with reduced thickness and enhanced critical current density. The spatial structure of the thermomagnetic avalanche events was resolved, and the reproducibility and nucleation thresholds were determined. Avalanches appearing at low fields are small intrusions at the tape edges, while larger fields create more extensive avalanches having dendritic structures similar to those observed in thin-film superconductors. In contrast to dendritic avalanches in thin films, the avalanches in the tapes show reproducibility to a larger extent. info:eu-repo/grantAgreement/ES/DGA/T12 info:eu-repo/grantAgreement/ES/MINECO/ENE2014-52105-R info:eu-repo/grantAgreement/ES/MINECO/MAT2011-22719 info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 2.861 2017 PHYSICS, CONDENSED MATTER 23 / 67 = 0.343 2017 Q2 T2 PHYSICS, APPLIED 41 / 146 = 0.281 2017 Q2 T1 1.036 2017 Ceramics and Composites 2017 Q1 Condensed Matter Physics 2017 Q1 Metals and Alloys 2017 Q1 Materials Chemistry 2017 Q1 Electrical and Electronic Engineering 2017 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0001-9625-5160 Laliena, Carlos (orcid)0000-0003-4839-5286 Martínez, Elena Universidad de Zaragoza Qviller, A.J. Vestgården, J.I. Johansen, T.H. (orcid)0000-0002-4140-4058 Navarro, Rafael Universidad de Zaragoza Mikheenko, P. 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 30, 12 (2017), [7 pp.] Supercond. sci. technol. SUPERCONDUCTOR SCIENCE & TECHNOLOGY 0953-2048 2905671 http://zaguan.unizar.es/record/75683/files/texto_completo.pdf Postprint 52268 http://zaguan.unizar.es/record/75683/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:75683 articulos driver 2019-07-09-12:33:20 ARTICLE