Improved performance of CSD-grown Y1-xGdxBa2Cu3O7-BaHfO3 nanocomposite films on Ni5W substrates

Y1-xGdxBa2Cu3O7-BaHfO3 (YGBCO-BHO) nanocomposite films containing 12 & x00A0;mol & x0025; BHO nanoparticles and different amounts of Gd, x, were grown by Chemical Solution Deposition (CSD) on Ni5W substrates in order to investigate the impact of the rare-earth stoichiometry on the structure and superconducting properties of these films. For Gd contents x > 0.5, epitaxial YGBCO-BHO films with an approximate thickness of 270 & x00A0;nm self-field critical current density Jc at 77 & x00A0;K & x223C; 1,5 & x00A0;MA & x002F;cm & x00B2; were obtained. The field dependence of the critical current density Jc(B) shows a much larger accommodation field and lower exponents & x03B1; in Jc & x223C; B(& x2212;& x03B1;) values compared to pristine YBCO films. This is both due to the high amount of individual nanoparticles in the matrix as observed in TEM images and the higher critical temperatures Tc. The results show that the CSD is a potential candidate for the preparation of REBCO films in long-length coated conductors.

Publication year:2020

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