Dendritic flux instability in MgB2 films above liquid hydrogen temperature

E. Baruch-El; M. Baziljevich; T. H. Johansen; J. Albrecht; A. Shaulov; Y. Yeshurun

doi:10.1088/1361-6668/aa9f41

Dendritic flux instability in MgB₂ films above liquid hydrogen temperature

E. Baruch-El, M. Baziljevich, T. H. Johansen, J. Albrecht, A. Shaulov, Y. Yeshurun

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Magnetic flux instability limits potential applications of superconductors such as MgB₂ in practical devices. Previous studies in MgB₂ films exposed to magnetic fields revealed the occurrence of dendritic flux avalanches at temperatures below T ∼ 10 K. In the present work it is shown that films of MgB₂ exposed to a fast-ramped magnetic field display a dendritic flux instability at elevated temperatures, up to 23 K. Such instability can therefore cause malfunctioning of practical devices based on MgB₂ films even when operating at liquid hydrogen temperature.

Original language	English
Article number	025005
Journal	Superconductor Science and Technology
Volume	31
Issue number	2
DOIs	https://doi.org/10.1088/1361-6668/aa9f41
State	Published - Feb 2018

Bibliographical note

Publisher Copyright:
© 2017 IOP Publishing Ltd.

Keywords

MgB
dendritic flux instability
liquid hydrogen
magneto-optical imaging
superconductivity

Access to Document

10.1088/1361-6668/aa9f41

Cite this

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abstract = "Magnetic flux instability limits potential applications of superconductors such as MgB2 in practical devices. Previous studies in MgB2 films exposed to magnetic fields revealed the occurrence of dendritic flux avalanches at temperatures below T ∼ 10 K. In the present work it is shown that films of MgB2 exposed to a fast-ramped magnetic field display a dendritic flux instability at elevated temperatures, up to 23 K. Such instability can therefore cause malfunctioning of practical devices based on MgB2 films even when operating at liquid hydrogen temperature.",

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AU - Baruch-El, E.

AU - Baziljevich, M.

AU - Johansen, T. H.

AU - Albrecht, J.

AU - Shaulov, A.

AU - Yeshurun, Y.

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AB - Magnetic flux instability limits potential applications of superconductors such as MgB2 in practical devices. Previous studies in MgB2 films exposed to magnetic fields revealed the occurrence of dendritic flux avalanches at temperatures below T ∼ 10 K. In the present work it is shown that films of MgB2 exposed to a fast-ramped magnetic field display a dendritic flux instability at elevated temperatures, up to 23 K. Such instability can therefore cause malfunctioning of practical devices based on MgB2 films even when operating at liquid hydrogen temperature.

KW - MgB

KW - dendritic flux instability

KW - liquid hydrogen

KW - magneto-optical imaging

KW - superconductivity

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