title: Epitaxial growth of BaHfO3buffer layer and its structure degeneration analysed by Raman spectrum.
abstract: BaHfO3(BHO) has been proposed as a new cap layer material for YBa2Cu3O7-δ(YBCO) coated conductors. Highly c-axis oriented BHO cap layer has been deposited on ion-beam assisted deposition-MgO buffered Hastelloy tapes by direct-current-magnetron sputtering method. The epi-growth of BHO films combined with its properties is investigated in details. The degenerated cubic crystal structure of BHO film is confirmed by Raman spectrum analysis. XRD θ-2θ scan, φ-scan and ω-scan reveal an excellent c-axis alignment with good in-plane and out-of-plane textures for BHO cap layers. SEM and AFM investigations show BHO cap layer a dense and crack-free morphology. Subsequently pure c-axis orientation YBCO film was epitaxial grown on such BHO cap layer successfully, shown BaHfO3a potential cap layer material for coated conductors.
authors.affiliation: Shanghai Key Laboratory of High Temperature Superconductors, Department of Physics, Shanghai University, Shanghai, 200444 China.
authors.forename: Jiahui
authors.initials: J
authors.lastname: Zheng
authors.affiliation: Shanghai Key Laboratory of High Temperature Superconductors, Department of Physics, Shanghai University, Shanghai, 200444 China.
authors.forename: Feng
authors.initials: F
authors.lastname: Fan
authors.affiliation: Shanghai Key Laboratory of High Temperature Superconductors, Department of Physics, Shanghai University, Shanghai, 200444 China.
authors.forename: Xiangfa
authors.initials: X
authors.lastname: Yan
authors.affiliation: Shanghai Key Laboratory of High Temperature Superconductors, Department of Physics, Shanghai University, Shanghai, 200444 China.
authors.forename: Yuming
authors.initials: Y
authors.lastname: Lu
authors.affiliation: Shanghai Creative Superconductor Technologies Co., Ltd, Fengxian District, Shanghai, 201401 China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Liang
authors.affiliation: Shanghai Key Laboratory of High Temperature Superconductors, Department of Physics, Shanghai University, Shanghai, 200444 China.
authors.forename: Chuanyi
authors.initials: C
authors.lastname: Bai
authors.affiliation: Shanghai Key Laboratory of High Temperature Superconductors, Department of Physics, Shanghai University, Shanghai, 200444 China.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Shanghai Key Laboratory of High Temperature Superconductors, Department of Physics, Shanghai University, Shanghai, 200444 China.
authors.forename: Yanqun
authors.initials: Y
authors.lastname: Guo
authors.affiliation: Shanghai Key Laboratory of High Temperature Superconductors, Department of Physics, Shanghai University, Shanghai, 200444 China.
authors.forename: Chuanbing
authors.initials: C
authors.lastname: Cai
keywords: BaHfO3; Cap layer; Coated conductors; Magnetron sputtering; Raman