Abstract
Power applications of superconductors will be tremendously boosted if an effective method for magnetic flux immobilization is discovered. Here, we report the most efficient vortex-pinning mechanism reported so far which, in addition, is based on a low-cost chemical solution deposition technique. A dense array of defects in the superconducting matrix is induced in YBa2Cu3O7−x–BaZrO3 nanocomposites where BaZrO3 nanodots are randomly oriented. Non-coherent interfaces are the driving force for generating a new type of nanostructured superconductor. Angle-dependent critical-current measurements demonstrate that a strong and isotropic flux-pinning mechanism is extremely effective at high temperatures and high magnetic fields leading to high-temperature superconductors with record values of pinning force. The maximum vortex-pinning force achieved at 65 K, 78 GN m−3, is 500% higher than that of the best low-temperature NbTi superconductors at 4.2 K and so a great wealth of high-field applications will be possible at high temperatures.
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Acknowledgements
We acknowledge the financial support from MEC (NANOARTIS, MAT2005-02047; NANOFUNCIONA, NAN2004-09133-CO3-01; FPU and RyC), Generalitat de Catalunya (Catalan Pla de Recerca SGR-0029 and CeRMAE), CSIC (PIF-CANNAMUS) and EU (HIPERCHEM, NMP4-CT2005-516858; SUPER3C, SES6-CT-2004-502615). The support of J. Santiso and C. Frontera in the X-ray diffraction analysis is acknowledged.
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Gutiérrez, J., Llordés, A., Gázquez, J. et al. Strong isotropic flux pinning in solution-derived YBa2Cu3O7−x nanocomposite superconductor films. Nature Mater 6, 367–373 (2007). https://doi.org/10.1038/nmat1893
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DOI: https://doi.org/10.1038/nmat1893
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