Processing and transport characteristics of YBCO tape conductors formed by IBAD method

Autor: K. Takeda, Osamu Kohno, Hosaka Mariko, Sadakata Nobuyuki, Yasuhiro Iijima, Nobuo Tanabe, Takashi Saitoh
Rok vydání: 1996
Předmět:
Zdroj: Applied Superconductivity. 4:475-485
ISSN: 0964-1807
DOI: 10.1016/s0964-1807(97)00034-3
Popis: Biaxially aligned YBa 2 Cu 3 O 7− x (YBCO) films were fabricated on random Ni-based alloy tapes with textured YSZ buffer layers deposited by ion-beam-assisted deposition (IBAD). Ar + ion bombardment was found to have significant effects on the crystalline structure of the YSZ buffer layers to align a [100] axis with the substrate normal and a [111] axis with the bombarding beam axis. The alignment mechanism is discussed with the structural properties of the YSZ films based on several proposed models. The azimuthal distribution of the a - and b -axes of the YBCO film on the top of the well-textured YSZ film was restricted to 10.2° FWHM. The high J c value of 1.13×10 6 A cm −2 (77 K, 0 T), the large I c value of 103 A (77 K, 0 T), the clear longitudinal field effect (enhanced by 1.7 at 77 K, 0.5 T), and the low self-field AC losses in accordance with the Norris’ formula for thin strip conductors were observed. All the transporting properties indicated that the biaxially aligned structure is a promising way to avoid percolated structures of superconducting current paths in YBCO conductors.
Databáze: OpenAIRE
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