title: Influences of calcination temperature on growth and superconducting properties of GdBa₂Cu₃O₇-δ films fabricated by fluorine-free metal organic deposition method.
abstract: GdBa2Cu3O7-δ is one of the best candidates for the superconducting coated conductors because it has high critical temperature and high critical current density under high magnetic fields. In this study, superconducting GdBa2Cu3O7-δ films were fabricated by fluorine-free metal organic deposition method via two different calcination temperatures, 723K and 873K, to examine the influence of calcination temperature on film growth and superconducting characteristics. Critical temperatures and critical current densities of the sample calcined at 873K were superior to the sample calcined at 723K. In the case of the sample calcined at 723K, the mixture of amorphous and crystalline phases was observed, and that of a- and c-axis oriented grains after the crystallization. In the case of the sample calcined at 873K, the randomly oriented crystalline phases were observed, and the mixture of c-axis oriented grains and (Gd, Al)2BaO4 phase after the crystallization. These microstructural changes caused the differences in superconducting characteristics.
authors.affiliation: Department of Materials Science and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan. yamada@zaiko.kyushu-u.ac.jp
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Yamada
authors.forename: Kenji
authors.initials: K
authors.lastname: Kaneko
authors.forename: Yuki
authors.initials: Y
authors.lastname: Yoshida
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nishiyama
authors.forename: Ryo
authors.initials: R
authors.lastname: Teranishi
authors.forename: Koji
authors.initials: K
authors.lastname: Suzuki
authors.forename: Motoji
authors.initials: M
authors.lastname: Ito
authors.forename: Osuke
authors.initials: O
authors.lastname: Miura
authors.forename: Ryusuke
authors.initials: R
authors.lastname: Kita
keywords: Fluorine-free metal organic deposition; GdBa(2)Cu(3)O(7−δ); Transmission electron microscopy