Tailoring Microstructure and Superconducting Properties in Thick BaHfO3 and Ba2Y(Nb/Ta)O6 Doped YBCO Films on Technical Templates

Sieger M, Pahlke P, Lao M, Eisterer M, Meledin A, Van Tendeloo G, Ottolinger R, Haenisch J, Holzapfel B, Usoskin A, Kursumovic A, Macmanus-Driscoll JL, Stafford BH, Bauer M, Nielsch K, Schultz L, Huehne R (2017)

Publication Type: Journal article

Publication year: 2017

Journal

IEEE Transactions on Applied Superconductivity Institute of Electrical and Electronics Engineers (IEEE)

Book Volume: 27

Article Number: 7797176

Journal Issue: 4

DOI: 10.1109/TASC.2016.2644858

Abstract

The current transport capability of YBa2Cu3O7-x (YBCO) based coated conductors (CCs) is mainly limited by two features: the grain boundaries of the used textured template, which are transferred into the superconducting film through the buffer layers, and the ability to pin magnetic flux lines by incorporation of defined defects in the crystal lattice. By adjusting the deposition conditions, it is possible to tailor the pinning landscape in doped YBCO in order to meet specific working conditions (T, B) for CC applications. To study these effects, we deposited YBCO layers with a thickness of about 1-2 μm using pulsed laser deposition on buffered rolling-assisted biaxially textured Ni-W substrates as well as on metal tapes having either an ion-beam-textured YSZ buffer or an MgO layer textured by inclined substrate deposition. BaHfO3 and the mixed double-perovskite Ba2Y(Nb/Ta)O6 were incorporated as artificial pinning centers in these YBCO layers. X-ray diffraction confirmed the epitaxial growth of the superconductor on these templates as well as the biaxially oriented incorporation of the secondary phase additions in the YBCO matrix. A critical current density Jc of more than 2 MA/cm was achieved at 77 K in self-field for 1-2 μm thick films. Detailed TEM (transmission electron microscopy) studies revealed that the structure of the secondary phase can be tuned, forming c -axis aligned nanocolumns, ab-oriented platelets, or a combination of both. Transport measurements show that the Jc anisotropy in magnetic fields is reduced by doping and the peak in the Jc(θ) curves can be correlated to the microstructural features.

Involved external institutions

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden DE Germany (DE) Technische Universität Wien / Vienna University of Technology AT Austria (AT) University of Antwerp / Universiteit Antwerpen BE Belgium (BE) Karlsruhe Institute of Technology (KIT) DE Germany (DE) Bruker HTS GmbH DE Germany (DE) University of Cambridge GB United Kingdom (GB) Theva Dünnschichttechnik GmbH DE Germany (DE)

How to cite

APA:

Sieger, M., Pahlke, P., Lao, M., Eisterer, M., Meledin, A., Van Tendeloo, G.,... Huehne, R. (2017). Tailoring Microstructure and Superconducting Properties in Thick BaHfO3 and Ba2Y(Nb/Ta)O6 Doped YBCO Films on Technical Templates. IEEE Transactions on Applied Superconductivity, 27(4). https://doi.org/10.1109/TASC.2016.2644858

MLA:

Sieger, Max, et al. "Tailoring Microstructure and Superconducting Properties in Thick BaHfO3 and Ba2Y(Nb/Ta)O6 Doped YBCO Films on Technical Templates." IEEE Transactions on Applied Superconductivity 27.4 (2017).

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