Fabrication of high-J(C) BaTiO3-doped YBa2Cu3O7-delta thin films by the low-fluorine TFA-MOD approach

摘要

YBa2Cu3O7-delta (YBCO) films with BaTiO3 (BTO) nanostructures were prepared by the low-fluorine trifluoroacetate-metal-organic deposition process using the precursor solution with the molar ratio of Y:Ba:Cu = 1.0:1.8:3.0. The high superconducting critical current density (J(C)) (77 K, self-filed) of 10 MA/cm(2) for YBCO films was obtained. This result arises mainly from the enhanced flux pinning by BTO and Y2Cu2O5 nanostructures in YBCO films. Moreover, the influence of the different holding temperatures at the pyrolysis step on the microstructure and superconducting properties of the final BTO-doped YBCO films was investigated. With increasing the holding temperature, denser surface, smaller full-width at half-maximum (FWHM) value of the YBCO (005) rocking curves and higher J(C) value were found in the BTO-doped YBCO films. (c) 2016 Elsevier B.V. All rights reserved.