A New Direct Process to Prepare YBa2Cu3O7-&#61540; films on Biaxially Textured Ag{110}<211>

TL;DR

This paper presents a novel direct process for preparing high-quality YBa2Cu3O7-δ films on biaxially textured Ag{110}<211> substrates using pulsed laser deposition, achieving high critical current density at 77K.

Contribution

It introduces a new method involving a thin template layer and optimized deposition conditions to enhance YBCO film orientation and superconducting performance.

Findings

Achieved c-axis oriented YBCO films with biaxial alignment.

Obtained a critical current density of 5×10^5 A/cm² at 77K.

Improved grain boundary connectivity through Ag diffusion.

Abstract

YBCO films were successfully prepared on biaxially textured Ag{110}<211> substrates by using pulsed laser deposition. X-ray diffraction results showed that the degree of preferential orientation of Ag{110}<211> substrates varied with increasing annealing temperature. With a thin template layer deposited at low temperature, YBCO film with c-axis orientation and in-plane biaxial alignment could be obtained at high deposition temperature. Scanning electron microscopy observation revealed that YBCO grains enlarged but Ag grains on the surface of the YBCO films became smaller with increasing deposition temperature. At optimal deposition conditions, Ag atoms diffuse into the YBCO grain boundaries, and then fill in the weak-link regions in the YBCO film, resulting in the conduction easier. Jc value of 5105A/cm2 was obtained at 77K and zero magnetic field for the best YBCO film in our work.