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Sueyoshi, Tetsuro*; Ozaki, Toshinori*; Semboshi, Satoshi*; Sakane, Hitoshi*; Nishizaki, Terukazu*; Ishikawa, Norito
IEEE Transactions on Applied Superconductivity, 35(5), p.8000205_1 - 8000205_5, 2025/08
We investigated additional pinning effect on in-field Jc properties of coated conductors including Y
O
nano-particles as artificial pinning centers (APCs), where three types of heavy-ion beams were employed. The addition of the irradiation defects enhanced the in-field Jc. Furthermore, more upward shift in the Jc was observed for the introduction of the defects with larger volume of the irradiation damage, not only in high magnetic fields but also in low magnetic fields. One factor of the irradiation effect is that the self-field Jc and the critical temperature (Tc) are relatively insensitive to the addition of the irradiation defects for the samples with APCs. Another is the glassy flux creep behavior over wide temperature region, suggesting that flux pinning by the combination of APCs and irradiation defects is strong against thermal fluctuation.
CuOy thin films under longitudinal magnetic field by using heavy-ion irradiationSueyoshi, Tetsuro*; Enokihata, Ryusei*; Yamaguchi, Hiroshi*; Semboshi, Satoshi*; Ozaki, Toshinori*; Sakane, Hitoshi*; Nishizaki, Terukazu*; Ishikawa, Norito
Superconductor Science and Technology, 37(7), p.075010_1 - 075010_7, 2024/06
Times Cited Count：1 Percentile：14.28(Physics, Applied)We attempted to improve the critical current density (Jc) under a longitudinal magnetic field (LMF) by using columnar defects (CDs) tilted toward the transport current, where the CDs were produced with 80 MeV Xe ions at an incident angle(s) up to 87.5 degree relative to the c-axis of YBaCuOy thin films. The formation of CDs extending throughout the film was confirmed by cross-sectional transmission electron microscopy. The CDs tilted at 87.5 degree weakened the magnetic field dependence of Jc under the LMF, providing a Jc higher than that of the unirradiated film in a high magnetic field. This is the first study to demonstrate that CDs and/or irradiation defects contribute to flux pinning under the LMF in high-Tc superconductors.
Sueyoshi, Tetsuro*; Kotaki, Tetsuya*; Furuki, Yuichi*; Fujiyoshi, Takanori*; Semboshi, Satoshi*; Ozaki, Toshinori*; Sakane, Hitoshi*; Kudo, Masaki*; Yasuda, Kazuhiro*; Ishikawa, Norito
Japanese Journal of Applied Physics, 59(2), p.023001_1 - 023001_7, 2020/02
Times Cited Count：9 Percentile：38.95(Physics, Applied)We show that Xe ion irradiation with 80 MeV to GdBaCuOy-coated conductors creates different morphologies of columnar defects (CDs) depending on the irradiation angles relative to the c-axis: continuous CDs with a larger diameter are formed for oblique irradiation at 
= 45
, whereas the same ion beam at a different angle ( = 0) induces the formation of discontinuous CDs. The direction-dependent morphologies of CDs significantly affect the angular behavior of the critical current density 
.
Xu, P. G.; Tomota, Yo*; Arakaki, Yu; Harjo, S.; Sueyoshi, Hitoshi*
Materials Characterization, 127, p.104 - 110, 2017/05
Times Cited Count：50 Percentile：92.47(Materials Science, Multidisciplinary)Ishikawa, Nobuyuki*; Sueyoshi, Hitoshi*; Suzuki, Hiroshi; Akita, Koichi
Yosetsu Gakkai Rombunshu (Internet), 29(3), p.218 - 224, 2011/08
Cold cracking test was conducted using Y-grooved constraint weld joint by intentionally introducing hydrogen gas, and critical hydrogen content in the weld metal to cold cracking was determined. Residual stress distribution in the weld meal was measured by neutron diffraction technique. The root portion showed highest tensile stress of over 1110 MPa in the transverse direction, which is the same as the crack opening direction.
Horiuchi, Yasuharu; Sato, Toshinori; Sueyoshi, Yoshitoshi*; Sano, Tadashi*; Hirai, Kazuhide*
no journal, ,
no abstracts in English
Sueyoshi, Hitoshi*; Ishikawa, Nobuyuki*; Suzuki, Hiroshi; Akita, Koichi
no journal, ,
Experiments of cold cracking on a hydrogen induced 980 MPa class restraint weld joint were performed and the residual stress distribution in the joint was analyzed using neutron diffraction technique. The critical conditions for the cold cracking of the weld joint was determined from the obtained results.
Hashizume, Shigeru; Sato, Toshinori; Horiuchi, Yasuharu; Sueyoshi, Yoshitoshi*; Sano, Tadashi*; Hirai, Kazuhide*
no journal, ,
no abstracts in English
Sueyoshi, Hitoshi*; Ishikawa, Nobuyuki*; Suzuki, Hiroshi; Akita, Koichi
no journal, ,
Experiments of cold cracking on a 980 MPa class restraint weld joint were performed and the residual stress distribution in the joint was analyzed using neutron diffraction technique. The critical conditions for the cold cracking of the weld joint was determined from the obtained results.
