Influence of artificial pinning centers on structural and superconducting properties of thick YBCO films on ABAD-YSZ templates

Pahlke P, Sieger M, Ottolinger R, Lao M, Eisterer M, Meledin A, Van Tendeloo G, Haenisch J, Holzapfel B, Schultz L, Nielsch K, Huehne R (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Superconductor Science and Technology

Book Volume: 31

Article Number: 044007

Journal Issue: 4

DOI: 10.1088/1361-6668/aaafbe

Abstract

Recent efforts in the development of YBa2Cu3O7-x (YBCO) coated conductors are devoted to the increase of the critical current I c in magnetic fields. This is typically realized by growing thicker YBCO layers as well as by the incorporation of artificial pinning centers. We studied the growth of doped YBCO layers with a thickness of up to 7 μm using pulsed laser deposition with a growth rate of about 1.2 nm s^-1. Industrially fabricated ion-beam textured YSZ templates based on metal tapes were used as substrates for this study. The incorporation of BaHfO3 (BHO) or Ba2Y(Nb0.5Ta0.5)O6 (BYNTO) secondary phase additions leads to a denser microstructure compared to undoped films. A purely c-axis-oriented YBCO growth is preserved up to a thickness of about 4 μm, whereas misoriented texture components were observed in thicker films. The critical temperature is slightly reduced compared to undoped films and independent of film thickness. The critical current density J c of the BHO- and BYNTO-doped YBCO layers is lower at 77 K and self-field compared to pure YBCO layers; however, I c increases up to a thickness of 5 μm. A comparison between films with a thickness of 1.3 μm revealed that the anisotropy of the critical current density J c(θ) strongly depends on the incorporated pinning centers. Whereas BHO nanorods lead to a strong B||c-axis peak, the overall anisotropy is significantly reduced by the incorporation of BYNTO forming a mixture of short c-axis-oriented nanorods and small (a-b)-oriented platelets. As a result, the J c values of the doped films outperform the undoped samples at higher fields and lower temperatures for most magnetic field directions.

Involved external institutions

Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden

Germany (DE) Technische Universität Wien / Vienna University of Technology

Austria (AT) University of Antwerp / Universiteit Antwerpen

Belgium (BE) Karlsruhe Institute of Technology (KIT)

Germany (DE)

How to cite

APA:

Pahlke, P., Sieger, M., Ottolinger, R., Lao, M., Eisterer, M., Meledin, A.,... Huehne, R. (2018). Influence of artificial pinning centers on structural and superconducting properties of thick YBCO films on ABAD-YSZ templates. Superconductor Science and Technology, 31(4). https://doi.org/10.1088/1361-6668/aaafbe

MLA:

Pahlke, Patrick, et al. "Influence of artificial pinning centers on structural and superconducting properties of thick YBCO films on ABAD-YSZ templates." Superconductor Science and Technology 31.4 (2018).

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