Microstructure and Improved J c–H Characteristic of Sr2Nb2O7-Doped Y0.5Gd0.5Ba2Cu3O7−x Thin Film Prepared by Pulsed Laser Deposition
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Sr2Nb2O7 (SNO)-doped Y0.5Gd0.5Ba2Cu3O7−x (YGBCO) and pure YGBCO thin films with pure c-axis orientation were prepared by pulsed laser deposition. Compared with a pure YGBCO film, T c and critical current density (J c) (77 K, 0 T) of the SNO-doped film decreased from 91.9 to 88.7 K and from 4.2 to 2.5 MA/cm2, respectively. SNO-doped YGBCO film exhibited significantly enhanced J c in a magnetic field up to 9 T at 4.2 K and up to 7 T at 65 K for B//C, indicating that the SNO-doped YGBCO film possessed more effective flux pinning centers, which were stacking faults, c-axis defects, and inclined defects identified by transmission electron microscopy analysis.
KeywordsSNO High-temperature superconductor Laser deposition Thin films Defects
This work was supported by the Ministry of Science and Technology of the People’s Republic of China ITER project (grant number 2011GB113004), the 863 project (grant number 2014AA032702), the Shanghai Commission of Science and Technology (grant numbers 11DZ1100402, 13DZ0500100, and 16521108302), and the Natural Science Foundation of China (grant numbers 11204174 and 51372150).
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