Presentation Information
[WB4-03-INV]A New Multifilament Method for Advanced Superconducting Tapes and Wires
*Ryo Teranishi1, Akiyoshi Matsumoto2, Masayoshi Inoue3, Takumi Ikenoue4, Yusuke Sogabe4 (1. Kyushu Univ. (Japan), 2. National Institute for Materials Science (Japan), 3. Fukuoka Institute of Technology (Japan), 4. Kyoto Univ. (Japan))
Keywords:
Multifilament,Microstructure,Thin film growth
[Purpose]
The multifilamentation of REBCO coatedconductors has conventionally been pursued via top-down approaches, such as laser scribing after tape fabrication. In this study, we propose a fundamentally different bottom-up approach for filamentarization.
[Method]
First, non-superconducting metal or oxide stripes are deposited in a fine-line pattern on the substrate surface using photolithography. Then, an REBCO layer is deposited by conventional techniques such as PLD or MOD. During deposition, we intentionally induce compositional inhomogeneity or crystal misorientation directly above the stripes, rendering these regions insulating and acting as gaps. On the bare substrate regions, REBCO grows epitaxially, resulting in an in-plane alternating array of superconducting and non-superconducting regions, effectively filamentarizing the layer.
[Results and discussion]
Zr stripes were fabricated on a 5 × 5 mm2 SrTiO3 substrate prior to YBCO film growth by MOD method. Magneto-optical image of a sample showed that clear bright lines along the vertical direction at the Zr stripe positions, confirming flux penetration and indicating selective formation of secondary phases or misoriented YBCO crystal regions above the Zr.
The presentation will include detailed microstructural analyses supporting this selective suppression of superconductivity above the stripes, demonstrating the feasibility of this bottom-up filamentarization approach.
The multifilamentation of REBCO coatedconductors has conventionally been pursued via top-down approaches, such as laser scribing after tape fabrication. In this study, we propose a fundamentally different bottom-up approach for filamentarization.
[Method]
First, non-superconducting metal or oxide stripes are deposited in a fine-line pattern on the substrate surface using photolithography. Then, an REBCO layer is deposited by conventional techniques such as PLD or MOD. During deposition, we intentionally induce compositional inhomogeneity or crystal misorientation directly above the stripes, rendering these regions insulating and acting as gaps. On the bare substrate regions, REBCO grows epitaxially, resulting in an in-plane alternating array of superconducting and non-superconducting regions, effectively filamentarizing the layer.
[Results and discussion]
Zr stripes were fabricated on a 5 × 5 mm2 SrTiO3 substrate prior to YBCO film growth by MOD method. Magneto-optical image of a sample showed that clear bright lines along the vertical direction at the Zr stripe positions, confirming flux penetration and indicating selective formation of secondary phases or misoriented YBCO crystal regions above the Zr.
The presentation will include detailed microstructural analyses supporting this selective suppression of superconductivity above the stripes, demonstrating the feasibility of this bottom-up filamentarization approach.