Microstructures Property and Improved J c of Eu-Doped YBa2Cu3.6O7−δ Thin Films by Trifluoroacetate Metal Organic Deposition Process
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YEuxBa2Cu3.6O7−δ (x = 0, 0.1, 0.3, 0.5) thin films were prepared on buffered substrates by trifluoroacetate metal organic deposition (TFA-MOD). The europium-doped film showed better out- and in-plane texture than the pure YBa2Cu3.6O7−δ thin film and special topography. In the meantime, the superconducting transition temperature T c was improved with the increase of europium content and spanned a small range when x= 0.5 doping levels. Besides, the J c value was obviously enhanced with europium addition, and YEu0.3Ba2Cu3.6O7−δ showed the best superconducting properties under self-field. Furthermore, the J c value was obviously improved under magnetic field, and the enhanced flux-pinning properties was also observed in europium-substituted samples which may be attributed to the good grain connections and the effective flux pinning centers introduced by europium addition. The thickness of prepared film samples were approximately 400 nm. The structure of samples were characterized by x-ray diffraction (XRD), Raman spectrum was used to investigate the crystallization and growth orientation, and the surface morphology of films were got by field-emission scanning electronic microscopy (FE-SEM). Moreover, energydispersive spectroscopy (EDS) was utilized to determine element composition. Spatial distribution of J c of the film was obtained by mapping analysis of inductive measurement at 77 K. And the superconducting properties under magnetic fields were measured by magnetic property measurement system with a SQUID magnetometer.
KeywordsCritical current density Europium addition Flux pinning TFA-MOD Microstructures Superconducting transition temperature
This work was supported in part by Shanghai Key Laboratory of High Temperature Superconductors (14DZ2260700); the Science and Technology Commission of Shanghai Municipality (16521108400, 16DZ0504300 and 14521102800), the National Natural Science Foundation of China (51572165, 11174193 and 51202141).
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