Microstructure of SrTO3 buffer layers and its effects on superconducting properties of YBa2CU3O7-(delta) coated conductors

作者：Wang H^*; Foltyn SR; Arendt PN; Jia QX; MacManus Driscoll JL; Stan L; Li Y; Zhang X; Dowden PC

来源：Journal of Materials Research, 2004, 19(6): 1869-1875.

DOI：10.1557/JMR.2004.0244

A thin layer of SrTiO3 (STO) has successfully been used as a buffer layer to grow high-quality superconducting YBa2Cu3O7-delta (YBCO) thick films on polycrystalline metal substrates with a biaxially oriented MgO template produced by ion-beam-assisted deposition. Using this architecture, 1.5-mum-thick YBCO films with an in-plane mosaic spread in the range of 2.5degrees to 3.5degrees in full width at half-maximum and critical current density over 2 x 10(6) A/cm(2) in self-field at 75 K have routinely been achieved. It is interesting to note that the pulsed laser deposition growth conditions of SrTiO3 buffer layers, such as growth temperature and oxygen pressure, have strong effects on the superconducting properties of YBCO. Detailed studies using transmission electron microscopy, scanning electron microscopy, and atomic force microscopy were used to explore the microstructures of STO deposited at different conditions and to understand further their effects on the growth and properties of YBCO films.

• 出版日期2004-6
• 单位Los Alamos