BaHfO3 artificial pinning centres in TFA-MOD-derived YBCO and GdBCO thin films

Erbe M, Haenisch J, Huehne R, Freudenberg T, Kirchner A, Molina-Luna L, Damm C, Van Tendeloo G, Kaskel S, Schultz L, Holzapfel B (2015)

Publication Type: Journal article

Publication year: 2015

Journal

Superconductor Science & Technology Institute of Physics: Hybrid Open Access

Book Volume: 28

Article Number: 114002

Journal Issue: 11

DOI: 10.1088/0953-2048/28/11/114002

Abstract

Chemical solution deposition (CSD) is a promising way to realize REBa2Cu3O7-x (REBCO; RE = rare earth (here Y, Gd))-coated conductors with high performance in applied magnetic fields. However, the preparation process contains numerous parameters which need to be tuned to achieve high-quality films. Therefore, we investigated the growth of REBCO thin films containing nanometre-scale BaHfO3 (BHO) particles as pinning centres for magnetic flux lines, with emphasis on the influence of crystallization temperature and substrate on the microstructure and superconductivity. Conductivity, microscopy and x-ray investigations show an enhanced performance of BHO nano-composites in comparison to pristine REBCO. Further, those measurements reveal the superiority of GdBCO to YBCO - e.g. by inductive critical current densities, J c, at self-field and 77 K. YBCO is outperformed by more than 1 MA cm^-2 with J c values of up to 5.0 MA cm^-2 for 265 nm thick layers of GdBCO(BHO) on lanthanum aluminate. Transport in-field J c measurements demonstrate high pinning force maxima of around 4 GN m^-3 for YBCO(BHO) and GdBCO(BHO). However, the irreversibility fields are appreciably higher for GdBCO. The critical temperature was not significantly reduced upon BHO addition to both YBCO and GdBCO, indicating a low tendency for Hf diffusion into the REBCO matrix. Angular-dependent J c measurements show a reduction of the anisotropy in the same order of magnitude for both REBCO compounds. Theoretical models suggest that more than one sort of pinning centre is active in all CSD films.

Involved external institutions

Karlsruhe Institute of Technology (KIT)

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

Germany (DE) Technische Universität Darmstadt

Germany (DE) University of Antwerp / Universiteit Antwerpen

Belgium (BE) Technische Universität Dresden

Germany (DE)

How to cite

APA:

Erbe, M., Haenisch, J., Huehne, R., Freudenberg, T., Kirchner, A., Molina-Luna, L.,... Holzapfel, B. (2015). BaHfO3 artificial pinning centres in TFA-MOD-derived YBCO and GdBCO thin films. Superconductor Science & Technology, 28(11). https://doi.org/10.1088/0953-2048/28/11/114002

MLA:

Erbe, M., et al. "BaHfO3 artificial pinning centres in TFA-MOD-derived YBCO and GdBCO thin films." Superconductor Science & Technology 28.11 (2015).

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