Improvement in Crystal Orientation and In-plane Alignment of La-doped YBCO Thin Film on BaZrO₃-buffered MgO Substrate

Abstract

Y 0.9 Ba 1.9 La 0.2 Cu 3 O y (La-YBCO) thin films were prepared by an off-axis magnetron sputtering method on MgO substrates with and without a BaZrO 3 buffer layer. Insertion of BaZrO 3 buffer layer was effective for obtaining La-YBCO films with pure c-axis orientation and in-plane alignment at low temperatures below 600°C. We prepared La-YBCO thin films on BaZrO 3 -buffered MgO substrates using a temperature-gradient method, in which a template La-YBCO layer was first deposited at 600°C, and then the temperature was continuously raised to 700°C. By this method, La-YBCO thin films with improved crystallinity were successfully prepared. It was also proved that the insertion of the BaZrO 3 buffer layer enables us to prepare high-quality La-YBCO films with high reproducibility.

Fabrication of 123‐type high‐ T c superconducting thin films on BaZrO 3 ‐buffered MgO substrates

“…They pointed out that the reduced interfacial energy between SmBCO and BZO by joint with common Ba-O bonds improved the crystal orientation of SmBCO films. Our preliminary experiments indicated that the insertion of the BZO-buffer was also effective to preprare c-axis-oriented La-YBCO thin films [10]. In this work, we demonstrate the effective utilization of the BZO-buffer to prepare purely c-axis-oriented La-YBCO films on MgO substrates using the hollow-body holder.…”

Influence of Circuit Pattern Layout on Characteristics of Interface-Modified Ramp-Edge Junctions

“…The process contains oxide film deposition, patterning by a conventional photolithography, ion-beam etching, and ashing for photoresist removal. A 200-nm-thick (La-YBCO) film deposited by off-axis dc magnetron sputtering on an MgO (100) substrate with a buffer was used for the ground plane [15]. A 250-nm-thick (100) film was deposited on the La-YBCO by off-axis rf magnetron sputtering for an insulating layer.…”