Dendritic flux avalanches in a superconducting MgB2 tape

Qureishy, T. ; Laliena, Carlos ; Martínez, Elena (Universidad de Zaragoza) ; Qviller, A.J. ; Vestgården, J.I. ; Johansen, T.H. ; Navarro, Rafael (Universidad de Zaragoza) ; Mikheenko, P.

Resumen: 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.

Idioma: Inglés

DOI: 10.1088/1361-6668/aa9244

Año: 2017

Publicado en: SUPERCONDUCTOR SCIENCE & TECHNOLOGY 30, 12 (2017), [7 pp.]
ISSN: 0953-2048

Factor impacto JCR: 2.861 (2017)

Categ. JCR: PHYSICS, CONDENSED MATTER rank: 23 / 67 = 0.343 (2017) - Q2 - T2
Categ. JCR: PHYSICS, APPLIED rank: 41 / 146 = 0.281 (2017) - Q2 - T1

Factor impacto SCIMAGO: 1.036 - Ceramics and Composites (Q1) - Condensed Matter Physics (Q1) - Metals and Alloys (Q1) - Materials Chemistry (Q1) - Electrical and Electronic Engineering (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/T12
Financiación: info:eu-repo/grantAgreement/ES/MINECO/ENE2014-52105-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2011-22719

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)