Texture improvement of sputtered YBa2Cu3O7−x films on MgO (100) with a SrTiO3 buffer layer

✍ Scribed by M.L. Lucía; J. Santamaría; E. Iborra; J.L. Hernández-Rojas; F. Sánchez-Quesada

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 374 KB
• Volume: 218
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)90265-r

✦ Synopsis

SrTiOs buffer layers have been grown on MgO ( 100) substrates to provide a better match to RF sputtered YBa&urOr_, films. This heterostntcture allows a highly textured growth to be achieved over thicknesses as high as 1 urn. The granularity of films grown without buffer layer on MgO ( 100) and YSZ ( 100) has been shown to be thickness dependent affecting the critical current density: J, at 77 K is typically 3 x lo5 A/cm2 in 1000 A thin films while it reduces to lo3 A/cm2 in 1 pm films. A study is presented of how the improvement of lattice matching makes the critical current density increase from lo3 A/cm2 for 1 pm fdms grown on YSZ to 4x lo5 A/cm2 for films grown with a SrTi03 buffer layer.