Elucidation of gap structure and enhancement of critical current density in iron-based superconductors by swift-particle irradiations

2021 Fiscal Year Annual Research Report

• Project/Area Number: 17H01141
• Research Institution: The University of Tokyo
• Principal Investigator: 為ケ井 強 東京大学, 大学院工学系研究科(工学部), 准教授 (30183073)
• Co-Investigator(Kenkyū-buntansha): 岡安 悟 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究主幹 (50354824) ; 一瀬 中 一般財団法人電力中央研究所, グリッドイノベーション研究本部, 上席研究員 (70371284)
• Project Period (FY): 2017-04-01 – 2022-03-31
• Keywords: 鉄系超伝導体 / 粒子線照射効果 / 臨界電流密度 / 超伝導ギャップ構造

Outline of Annual Research Achievements

鉄系超伝導体を主な対象として、プロトンや重イオン等の高エネルギー粒子線照射により生成される欠陥を用いて、基礎面では超伝導発現機構に関連する超伝導ギャップ構造の解明を、応用面では臨界電流密度の増強を目指して研究を行い、以下の成果を得た。
１、10 mを超える長さの(Ba,A)Fe2As2 (A: Na,K)丸型線材を用いて小型マグネットの試作し、発生磁場の評価を行った。加えて、線材の構造および局所的臨界電流密度を評価。２、異方性の大きな鉄系超伝導体であるKCa2Fe4As4F2単結晶における臨界電流密度に対する粒子線照射効果の詳細な解析を行った。３、残留抵抗率の異なるFeSe単結晶において低温・高磁場相の相境界を詳細に調べ、この相転移に対する乱れの効果を評価した。４、(Ba,Na)Fe2As2単結晶に3 MeVのプロトンを照射し、Tcに対する破壊効果の定量的評価を行った。５、様々な配置で重イオン照射したNbSe2におけるピーク効果を様々な条件で測定し、ピーク効果に関する重要な知見を得た。６、粒子線照射したNbSe2におけるTcおよび結晶格子定数の変化を精密に測定し、Tcの抑制には照射欠陥による散乱よりも結晶格子の膨張がより強く寄与していることを明らかにした。７、平板状の超伝導体の超伝導面に垂直に磁場を印加したときに発生する磁束・反磁束境界のダイナミクスを(Ba,Rb)Fe2As2単結晶において詳細に調べた。８、強磁性超伝導体EuFe2(As,P)2の磁気特性に対する照射欠陥導入効果の検討を行った。９、YBaCu3O7単結晶における重イオン照射効果を最適ドープのTc=90Kの試料のみでなく、Tc=60Kおよびより低いTcを持った試料においても測定し、磁束の柱状欠陥からのデピニングによると考えられるJcの急激な減少と試料の特性パラメターとの相関を明らかにした。

Research Progress Status

令和3年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和3年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] Politecnico di Torino(イタリア)
  • Country Name: ITALY
  • Counterpart Institution: Politecnico di Torino
• [Int'l Joint Research] Southeast University/SIMIT, Chinese Academy of Sciences(中国)
  • Country Name: CHINA
  • Counterpart Institution: Southeast University/SIMIT, Chinese Academy of Sciences
• [Int'l Joint Research] Ames Laboratory(米国)
  • Country Name: U.S.A.
  • Counterpart Institution: Ames Laboratory
• [Journal Article] Trapping a magnetic field of 17.89 T in stacked coated conductors by suppression of flux jumps (2022)
  • Author(s): Masahiro Suyama, Sunseng Pyon, Yasuhiro Iijima, Satoshi Awaji, and Tsuyoshi Tamegai,
  • Journal Title: Supercond. Sci. Technol. Volume: 35 Pages: 02LT01_1-7
  • DOI: 10.1088/1361-6668/ac4560
  • Peer Reviewed
• [Journal Article] High-frequency ac susceptibility of iron-based superconductors (2022)
  • Author(s): Gianluca Ghigo, Michela Fracasso, Roberto Gerbaldo, Laura Gozzelino, Francesco Laviano, Andrea Napolitano, Guang-Han Cao, Ruslan Prozorov, Tsuyoshi Tamegai, Zhixiang Shi, Xiangzhuo Xing, and Daniele Torsello,
  • Journal Title: Materials Volume: 15 Pages: 1079_1-12
  • DOI: 10.3390/ma15031079
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Electronic transport properties and hydrostatic pressure effect of FeSe0.67Te0.33 single crystals free of phase separation (2021)
  • Author(s): Xiangzhuo Xing, Yue Sun, Xiaolei Yi, Meng Li, Jiajia Feng, Yan Meng, Yufeng Zhang, Wenchong Li, Nan Zhou, Xiude He, Junyi Ge, Wei Zhou, Tsuyoshi Tamegai, and Zhixiang Shi,
  • Journal Title: Supercond. Sci. Technol. Volume: 34 Pages: 055006_1-10
  • DOI: 10.1088/1361-6668/abef4e
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Trapping a magnetic field of 14.8 T using stacked coated conductors of 12 mm width (2021)
  • Author(s): Masahiro Suyama, Sunseng Pyon, Yasuhiro Iijima, Satoshi Awaji, and Tsuyoshi Tamegai,
  • Journal Title: Supercond. Sci. Technol. Volume: 34 Pages: 065004_1-8
  • DOI: 10.1088/1361-6668/abf621
  • Peer Reviewed
• [Journal Article] Comparative study of superconducting and normal-state anisotropy in Fe1+yTe0.6Se0.4 superconductors with controlled amounts of interstitial excess Fe (2021)
  • Author(s): Yue Sun, Yongqiang Pan, Nan Zhou, Xiangzhuo Xing, Zhixiang Shi, Jinhua Wang, Zengwei Zhu, Akira Sugimoto, Toshikazu Ekino, Tsuyoshi Tamegai, and Haruhisa Kitano,
  • Journal Title: Phys. Rev. B Volume: 103 Pages: 224506_1-8
  • DOI: 10.1103/PhysRevB.103.224506
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Effect of controlled artificial disorder on the magnetic properties of EuFe2(As1?xPx)2 ferromagnetic superconductor (2021)
  • Author(s): Sunil Ghimire, Marcin Konczykowski, Kyuil Cho, Makariy Tanatar, Daniele Torsello, Ivan S. Veshchunov, Tsuyoshi Tamegai, Gianluca Ghigo, and Ruslan Prozorov,
  • Journal Title: Materials Volume: 14 Pages: 3267_1-17
  • DOI: 10.3390/ma14123267
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Fabrication of small superconducting coils using (Ba,A)Fe2As2 (A: Na, K) round wires with large critical current densities (2021)
  • Author(s): Sunseng Pyon, Haruto Mori, Tsuyoshi Tamegai, Satoshi Awaji, Hijiri Kito, Shigeyuki Ishida, Yoshiyuki Yoshida, Hideki Kajitani, Norikiyo Koizumi,
  • Journal Title: Supercond. Sci. Technol. Volume: 34 Pages: 105008_1-10
  • DOI: 10.1088/1361-6668/ac0cca
  • Peer Reviewed
• [Journal Article] Critical current density and vortex dynamics in pristine and irradiated KCa2Fe4As4F2 (2021)
  • Author(s): Sunseng Pyon, Soichi Taya, Yuto Kobayashi, Ayumu Takahashi, Wenjie Li, Toshihiro Taen, Teng Wang, Gang Mu, Hisashi Kitamura, Ataru Ichinose, and Tsuyoshi Tamegai,
  • Journal Title: Materials Volume: 14 Pages: 5283_1-19
  • DOI: 10.3390/ma14185283
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Disorder-robust high-field superconducting phase of FeSe single crystals (2021)
  • Author(s): Nan Zhou, Yue Sun, C. Y. Xi, Z. S. Wang, Y. F. Zhang, C. Q. Xu, Y. Q. Pan, J. J. Feng, Y. Meng, X. L. Yi, L. Pi, T. Tamegai, X. Z. Xing, and Z. X. Shi,
  • Journal Title: Phys. Rev. B Volume: 104 Pages: L140504_1-6
  • DOI: 10.1103/PhysRevB.104.L140504
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Peak Effects in 2H-NbSe2 Single Crystals Induced by Particle Irradiations (2021)
  • Author(s): Wenjie Li, Sunseng Pyon, Satoru Okayasu, and Tsuyoshi Tamegai,
  • Journal Title: J. Phys.: Conf. Ser. Volume: 1975 Pages: 012003_1-5
  • DOI: 10.1088/1742-6596/1975/1/012003
  • Peer Reviewed / Open Access
• [Journal Article] Focused ion beam microfabrication of single-crystal nanobridge toward Fe(Te,Se)-based Josephson device (2021)
  • Author(s): Takamaro Miyazawa, Naoki Tadokoro, Tsuyoshi Tamegai, Yue Sun, and Haruhisa Kitano,
  • Journal Title: J. Phys.: Conf. Ser. Volume: 1975 Pages: 012003_1-7
  • DOI: 10.1088/1742-6596/1975/1/012010
  • Peer Reviewed / Open Access
• [Journal Article] Anisotropic Critical Current Densities in Ba0.6K0.4Fe2As2 with Splayed Columnar Defects (2021)
  • Author(s): Jiachen Wang, Ayumu Takahashi, Sunseng Pyon, Atsushi Yoshida, Tadashi Kambara, Yue Sun, Haruhisa Kitano, Tsuyoshi Tamegai,
  • Journal Title: J. Phys.: Conf. Ser. Volume: 1975 Pages: 012012_1-5
  • DOI: 10.1088/1742-6596/1975/1/012012
  • Peer Reviewed / Open Access
• [Journal Article] Growth and Characterization of Iron-based Superconductor (Ba1-xRbx)Fe2As2 Single Crystals (2021)
  • Author(s): T. Ren, S. Pyon, and T. Tamegai,
  • Journal Title: J. Phys.: Conf. Ser. Volume: 1975 Pages: 012013_1-6
  • DOI: 10.1088/1742-6596/1975/1/012013
  • Peer Reviewed / Open Access
• [Journal Article] Crossed-Field Demagnetization of a EuBa2Cu3O7 Coated Conductor with BaHfO3 Nanorods (2021)
  • Author(s): M. Suyama, S. Pyon, Y. Iijima, and T. Tamegai,
  • Journal Title: J. Phys.: Conf. Ser. Volume: 1975 Pages: 012014_1-5
  • DOI: 10.1088/1742-6596/1975/1/012014
  • Peer Reviewed / Open Access
• [Journal Article] Development of Superconducting Coils using (Ba,Na)Fe2As2 Round Wires with Large Critical Current (2021)
  • Author(s): S. Pyon, H. Mori, T. Tamegai, H. Kajitani, N. Koizumi, S. Awaji, H. Kito, S. Ishida and Y. Yoshida,
  • Journal Title: J. Phys.: Conf. Ser. Volume: 1590 Pages: 012020_1-6
  • DOI: 10.1088/1742-6596/1975/1/012020
  • Peer Reviewed / Open Access
• [Presentation] Novel Behavior of Relaxation of Magnetization in a Remagnetized (Ba,Rb)Fe2As2 (2022)
  • Author(s): 任統
  • Organizer: 第 13回 低温科学研究センター研究交流会
• [Presentation] ミスフィット層状超伝導体の異方性の測定 (2022)
  • Author(s): 松澤創一郎
  • Organizer: 第 13回 低温科学研究センター研究交流会
• [Presentation] TDGL方程式の数値シミュレーションによる微小超伝導体における磁束配置の可視化 (2022)
  • Author(s): 松前拓実, 卞舜生, 為ヶ井強
  • Organizer: 第77回日本物理学会年会
• [Presentation] Vortex Dynamics and Critical Current Densities in Cuprate Superconductors with Splayed Columnar Defects (2022)
  • Author(s): J. Wang, N. Ito, S. Pyon, T. Nishizaki, and T. Tamegai
  • Organizer: 第77回日本物理学会年会
• [Presentation] 積層コーテッドコンダクターの加工方法の評価と円筒型マグネットの試作 (2022)
  • Author(s): 陶山正裕, 卞舜生, 飯島康裕, 為ヶ井強
  • Organizer: 第77回日本物理学会年会
• [Presentation] (Ba,A)Fe2As2(A:Na,K)丸線の曲げ歪み評価と超伝導コイルの作製 (2022)
  • Author(s): 卞舜生, 伊藤嵩真, 為ヶ井強, 梶谷秀樹,小泉徳潔, 鬼頭聖, 淡路智
  • Organizer: 第77回日本物理学会年会
• [Presentation] Magnetic-field trapping in (Ba,Na)Fe2As2 bulk (2022)
  • Author(s): Wenxi Wu, Sunseng Pyon, and Tsuyoshi Tamegai
  • Organizer: 第77回日本物理学会年会
• [Presentation] ミスフィット層状超伝導体の異方性の測定 (2022)
  • Author(s): 松澤創一郎, 一瀬中, 卞舜生, 為ヶ井強
  • Organizer: 第77回日本物理学会年会
• [Presentation] Novel Behavior of Relaxation of Magnetization in a Remagnetized (Ba,Rb)Fe2As2 (2022)
  • Author(s): 任 統, 卞舜生, 為ヶ井強
  • Organizer: 第77回日本物理学会年会
• [Presentation] Anomalous peak effect in (Ba,A)Fe2As2 (A: Rb, K) single crystals with splayed columnar defects (2022)
  • Author(s): Yuhang Zu, Tong Ren, Sunseng Pyon, Satoru Okayasu, and Tsuyoshi Tamegai
  • Organizer: 第77回日本物理学会年会
• [Presentation] Impacts of Defects on the Peak Effect in NbSe2 (2021)
  • Author(s): T. Tamegai,W. J. Li, S. Pyon, S. Okayasu, T. Kambara, A. Yoshida, Y. Kanai, and A. Ichinose
  • Organizer: Vortex2021
  • Int'l Joint Research / Invited
• [Presentation] Out-of-plane transport properties of FeSe single crystal (2021)
  • Author(s): Y. Sun, T. Miyazawa, T. Tamegai, and H. Kitano
  • Organizer: QLC2021
  • Int'l Joint Research
• [Presentation] Contribution of Josephson current and its nonequilibrium effects in the c axis short weak links of FeTe0.6Se0.4 superconductors (2021)
  • Author(s): T. Miyazawa, S. Horikawa, T. Tamegai, Y. Sun and H. Kitano
  • Organizer: QLC2021
  • Int'l Joint Research
• [Presentation] 磁気緩和に対する粒子線照射効果 鉄系超伝導体、NbSe2を中心に (2021)
  • Author(s): 為ヶ井強
  • Organizer: 第3回材料研究会/九州・西日本支部合同研究会
  • Invited
• [Presentation] 不足ドープ組成のBaFe2(As1-xPx)2 (2021)
  • Author(s): 神保恒大郎, 孫悦, 為ヶ井強A, 北野晴久
  • Organizer: 日本物理学会2021年秋季大会
• [Presentation] サイズ調整したBa1-xNaxFe2As2丸線のIc向上による超伝導コイルの性能向上 (2021)
  • Author(s): 卞舜生, 為ヶ井強, 梶谷秀樹, 小泉徳潔, 鬼頭聖, 淡路智
  • Organizer: 日本物理学会2021年秋季大会
• [Presentation] トポロジカル超伝導体SrxBi2Se3単結晶における超伝導特性向上と電気抵抗率の磁場角度依存性 (2021)
  • Author(s): 松前拓実, 卞舜生, 為ヶ井強
  • Organizer: 日本物理学会2021年秋季大会
• [Presentation] 積層コーテッドコンダクターにおける熱磁気不安定性の抑制と強磁場捕捉 (2021)
  • Author(s): 陶山正裕, 卞舜生, 飯島康裕, 淡路智, 為ヶ井強
  • Organizer: 日本物理学会2021年秋季大会
• [Presentation] Meissner Hole and Vortex Dynamics in Pristine and Irradiated (Ba,Rb)Fe2As2 (2021)
  • Author(s): 任統, 卞舜生, 為ヶ井強
  • Organizer: 日本物理学会2021年秋季大会
• [Presentation] Pinning Properties and Critical Current Densities in 90 K-phase and 60 K-phase YBa2Cu3O7 with Splayed Columnar Defects (2021)
  • Author(s): Jiachen Wang, Nozomu Ito, Sunseng Pyon, Terukazu Nishizaki, Tsuyoshi Tamegai
  • Organizer: 日本物理学会2021年秋季大会
• [Presentation] Effects of 2.6 GeV U irradiation on NbSe2 single crystals (2021)
  • Author(s): Wenjie Li, Sunseng Pyon, Ataru Ichinose, Atsushi Yoshida, Tadashi Kambara, Yasuyuki Kanai, Satoru Okayasu, Tsuyoshi Tamegai
  • Organizer: 日本物理学会2021年秋季大会
• [Presentation] Depairing critical current density of FeSe single crystal (2021)
  • Author(s): Y. Sun, T. Miyazawa, T. Tamegai, H. Kitano
  • Organizer: 日本物理学会2021年秋季大会
• [Presentation] ミスフィット層状化合物(BiSe)1+δNbSe2が示す二次元的超伝導特性 (2021)
  • Author(s): 松澤創一郎, 松前拓実, 一瀬中, 卞舜生, 為ヶ井強
  • Organizer: 日本物理学会2021年秋季大会
• [Presentation] Developments of superconducting coils using (Ba,A)Fe2As2 (A: Na, K) round wires with large critical current densities (2021)
  • Author(s): Tsuyoshi Tamegai, Sunseng Pyon, Haruto Mori, Satoshi Awaji, Hijiri Kito, Shigeyuki Ishida, Yoshiyuki Yoshida, Hideki Kajitani, Norikiyo Koizumi
  • Organizer: EUCAS2021
  • Int'l Joint Research
• [Presentation] CaKFe4As4とKCa2Fe4As4F2 における磁束状態 (2021)
  • Author(s): 為ヶ井 強, 小林 優斗, 卞 舜生, T. Wang, G. Mu, 岡安 悟, 一瀬 中
  • Organizer: ワークショップ「超伝導物質、トポロジカル物質」
  • Int'l Joint Research
• [Presentation] Interplay between Effects of Intrinsic and Artificial Defects on Jc in CaKFe4As4 (2021)
  • Author(s): T. Tamegai, A. Takahashi, Y. Kobayashi, S. Pyon, T. Kambara, A. Yoshida, S. Okayasu, A. Ichinose
  • Organizer: ICSM2021
  • Int'l Joint Research / Invited
• [Presentation] Peak Effects in 2H-NbSe2 Single Crystals Introduced with Artificial Defects by Particle Irradiations (2021)
  • Author(s): W. J. Li, S. Pyon, A. Ichinose, S. Okayasu, and T. Tamegai
  • Organizer: ISS2021
  • Int'l Joint Research
• [Presentation] Electrical Transport and Magnetic Properties of High-Quality SrxBi2Se3 Single Crystals Obtained by Annealing (2021)
  • Author(s): Takumi Matsumae, Sunseng Pyon, and Tsuyoshi Tamegai
  • Organizer: ISS2021
  • Int'l Joint Research
• [Presentation] Characterizations of Anisotropic Superconductivity in (BiSe)1+δNbSe2 (2021)
  • Author(s): Soichiro Matsuzawa, Sunseng Pyon, and Tsuyoshi Tamegai
  • Organizer: ISS2021
  • Int'l Joint Research
• [Presentation] Fabrication of superconducting coil using size adjusted (Ba,Na)Fe2As2 long round wire (2021)
  • Author(s): Sunseng Pyon, Tsuyoshi Tamegai, Hideki Kajitani, Norikiyo Koizumi, Satoshi Awaji, Hijiri Kito, Shigeyuki Ishida, and Yoshiyuki Yoshida
  • Organizer: ISS2021
  • Int'l Joint Research
• [Presentation] Tracking the Meissner Hole and Relaxation of Magnetization in (Ba,Rb)Fe2As2 (2021)
  • Author(s): Tong Ren, Senseng Pyon, and Tsuyoshi Tamegai
  • Organizer: ISS2021
  • Int'l Joint Research
• [Presentation] Vortex Dynamics and Critical Current Densities in 90 K-phase and 60 K-phase YBa2Cu3O7 with Splayed Columnar Defects (2021)
  • Author(s): Jiachen Wang, Nozomu Ito, Sunseng Pyon, Terukazu Nishizaki, and Tsuyoshi Tamegai
  • Organizer: ISS2021
  • Int'l Joint Research