Substrate Influence on Dendritic Flux Instability in YBCO Thin Films

E. Baruch-El; M. Baziljevich; T. H. Johansen; Y. Yeshurun

doi:10.1007/s10948-014-2723-9

Substrate Influence on Dendritic Flux Instability in YBCO Thin Films

E. Baruch-El, M. Baziljevich, T. H. Johansen, Y. Yeshurun

Department of Physics

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

11 Scopus citations

Abstract

We have investigated the effect of substrate thermal conductivity on dendritic flux formation in thin superconducting YBa ₂Cu ₃O_7−x films grown on yttrium-stabilized zirconia, SrTiO ₃, MgO, and sapphire, exploiting a recently developed ultra-fast magneto-optical imaging system and its ultra-fast field ramp (3 kT/s). Dendritic flux formation triggered solely by rapid ramping of the external field is reported for the first time in YBCO on yttrium-stabilized zirconia, the substrate with the lowest thermal conductivity. For the other substrates, the dendritic instability could be generated only after introducing an artificial defect at the edge, enhancing the local induction. We find that the upper temperature threshold for the appearance of dendrites depends on the thermal conductivity of the substrate.

Original language	English
Pages (from-to)	379-382
Number of pages	4
Journal	Journal of Superconductivity and Novel Magnetism
Volume	28
Issue number	2
DOIs	https://doi.org/10.1007/s10948-014-2723-9
State	Published - Feb 2014

Bibliographical note

Publisher Copyright:
© 2014, Springer Science+Business Media New York.

Funding

The authors thank Dr. Robert Semerad for preparing samples and helpful discussions. We acknowledge a partial financial support from the Israel Science Foundation (Grant No. 164/12) and the Norwegian Research Council.

Funders	Funder number
Israel Science Foundation	164/12
Norges Forskningsråd

Keywords

Dendritic flux instability
High temperature superconductors (HTS)
Thermal conductivity
Ultra-fast magneto-optical (MO) imaging

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10.1007/s10948-014-2723-9

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abstract = "We have investigated the effect of substrate thermal conductivity on dendritic flux formation in thin superconducting YBa 2Cu 3O7−x films grown on yttrium-stabilized zirconia, SrTiO 3, MgO, and sapphire, exploiting a recently developed ultra-fast magneto-optical imaging system and its ultra-fast field ramp (3 kT/s). Dendritic flux formation triggered solely by rapid ramping of the external field is reported for the first time in YBCO on yttrium-stabilized zirconia, the substrate with the lowest thermal conductivity. For the other substrates, the dendritic instability could be generated only after introducing an artificial defect at the edge, enhancing the local induction. We find that the upper temperature threshold for the appearance of dendrites depends on the thermal conductivity of the substrate.",

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Substrate Influence on Dendritic Flux Instability in YBCO Thin Films

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