Combined effect of flux pinning by three-directional columnar defects in a field-angular region of high-Tc superconductors

Tetsuro Sueyoshi; Ryusei Enokihata; Yuka Hidaka; Masahiro Irie; Takanori Fujiyoshi; Yasuki Okuno; Norito Ishikawa

doi:10.1016/j.physc.2021.1353824

Combined effect of flux pinning by three-directional columnar defects in a field-angular region of high-T_c superconductors

Tetsuro Sueyoshi, Ryusei Enokihata, Yuka Hidaka, Masahiro Irie, Takanori Fujiyoshi, Yasuki Okuno, Norito Ishikawa

Research output: Contribution to journal › Article › peer-review

Abstract

We investigated the combined effect of flux pinning by three-directional columnar defects (CDs) in a wide field-angular range of YBa₂Cu₃O_y thin films, where CDs parallel to the c-axis and CDs crossing at ±θ_i (θ_i = 45°, 60° and 80°) relative to the c-axis were installed by 200 MeV Xe-ion irradiations. The three-directional CDs with θ_i ≤ ±60° form a field angular curve of critical current density J_c with a broad peak centered at magnetic field (B) parallel to the c-axis, whereas the J_c shows no peaks around the crossing angles of ±θ_i. When the crossing angle is expanded to θ_i= ±80°, a drastic change in the field- angular behavior of J_c is induced: there is not a large enhancement of J_c around B || c, but two large peaks of J_c emerge at the two irradiation angles of θ_i= ±80°. We also demonstrated that the combined configuration consisting of CDs at θ_i = 0°, ±45°, ±60° and ±80° provides a uniform enhancement of J_c over a wide angular-region.

Original language	English
Article number	1353824
Journal	Physica C: Superconductivity and its applications
Volume	582
DOIs	https://doi.org/10.1016/j.physc.2021.1353824
Publication status	Published - 2021 Mar 15
Externally published	Yes

Keywords

Critical current density
Flux pinning
High-T superconductors
Ion-irradiation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2021.1353824

Cite this

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title = "Combined effect of flux pinning by three-directional columnar defects in a field-angular region of high-Tc superconductors",

abstract = "We investigated the combined effect of flux pinning by three-directional columnar defects (CDs) in a wide field-angular range of YBa2Cu3Oy thin films, where CDs parallel to the c-axis and CDs crossing at ±θi (θi = 45°, 60° and 80°) relative to the c-axis were installed by 200 MeV Xe-ion irradiations. The three-directional CDs with θi ≤ ±60° form a field angular curve of critical current density Jc with a broad peak centered at magnetic field (B) parallel to the c-axis, whereas the Jc shows no peaks around the crossing angles of ±θi. When the crossing angle is expanded to θi= ±80°, a drastic change in the field- angular behavior of Jc is induced: there is not a large enhancement of Jc around B || c, but two large peaks of Jc emerge at the two irradiation angles of θi= ±80°. We also demonstrated that the combined configuration consisting of CDs at θi = 0°, ±45°, ±60° and ±80° provides a uniform enhancement of Jc over a wide angular-region.",

keywords = "Critical current density, Flux pinning, High-T superconductors, Ion-irradiation",

author = "Tetsuro Sueyoshi and Ryusei Enokihata and Yuka Hidaka and Masahiro Irie and Takanori Fujiyoshi and Yasuki Okuno and Norito Ishikawa",

note = "Funding Information: This work was supported by KAKENHI ( JP16K06269 and JP19K04474 ) from the Japan Society for the Promotion of Science and was partly performed under the Common-Use Facility Program of JAEA . Publisher Copyright: {\textcopyright} 2021",

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AU - Sueyoshi, Tetsuro

AU - Enokihata, Ryusei

AU - Hidaka, Yuka

AU - Irie, Masahiro

AU - Fujiyoshi, Takanori

AU - Okuno, Yasuki

AU - Ishikawa, Norito

N1 - Funding Information: This work was supported by KAKENHI ( JP16K06269 and JP19K04474 ) from the Japan Society for the Promotion of Science and was partly performed under the Common-Use Facility Program of JAEA . Publisher Copyright: © 2021

PY - 2021/3/15

Y1 - 2021/3/15

N2 - We investigated the combined effect of flux pinning by three-directional columnar defects (CDs) in a wide field-angular range of YBa2Cu3Oy thin films, where CDs parallel to the c-axis and CDs crossing at ±θi (θi = 45°, 60° and 80°) relative to the c-axis were installed by 200 MeV Xe-ion irradiations. The three-directional CDs with θi ≤ ±60° form a field angular curve of critical current density Jc with a broad peak centered at magnetic field (B) parallel to the c-axis, whereas the Jc shows no peaks around the crossing angles of ±θi. When the crossing angle is expanded to θi= ±80°, a drastic change in the field- angular behavior of Jc is induced: there is not a large enhancement of Jc around B || c, but two large peaks of Jc emerge at the two irradiation angles of θi= ±80°. We also demonstrated that the combined configuration consisting of CDs at θi = 0°, ±45°, ±60° and ±80° provides a uniform enhancement of Jc over a wide angular-region.

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KW - Ion-irradiation

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