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We report room temperature ferromagnetism in superconducting YBa2Cu3O7-δ/Y2BaCuO5 composites prepared by a citric acid complexing-hydrothermal synthesis coupled method. Scanning electron microscopy observation shows the formation of solid and hollow microspheres. These microspheres are composed of many irregular particles with the size of 100–500 nm. A superconducting transition about 93 K is revealed...
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