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We report on compositional tuning to create excellent field-performance of in “self-doped,” GdBa Cu O (GdBCO) coated conductors grown by ultrafast reactive co-evaporation. In order to give excess liquid and GdO, the overall compositions were all Ba-poor and Cu-rich compared to GdBCO. The precise composition was found to be critical to the current carrying performance. The most copper-rich composition had an optimum self-field of 3.2 MA cm−2. A more Gd-rich composition had the best in-field performance because of the formation of low coherence, splayed GdO nanoparticles, giving (77 K, 1 T) of over 1 MA cm−2 and (77 K, 5 T) of over 0.1 MA cm−2.


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