電気化学的手法による鉄系超伝導体の超伝導化

• Project/Area Number: 16J05432
• Research Category: Grant-in-Aid for JSPS Fellows
• Allocation Type: Single-year Grants
• Section: 国内
• Research Field: Inorganic materials/Physical properties
• Research Institution: University of Tsukuba
• Principal Investigator: 山下 愛智 筑波大学, 数理物質科学研究科, 特別研究員(DC1)
• Project Period (FY): 2016-04-22 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥2,800,000 (Direct Cost: ¥2,800,000); Fiscal Year 2018: ¥900,000 (Direct Cost: ¥900,000); Fiscal Year 2017: ¥900,000 (Direct Cost: ¥900,000); Fiscal Year 2016: ¥1,000,000 (Direct Cost: ¥1,000,000)
• Keywords: 鉄カルコゲナイド超伝導体 / ゼロ抵抗 / 電気化学合成 / 鉄系超伝導 / 鉄系超伝導体 / 電気化学反応

Outline of Annual Research Achievements

近年発見された鉄系超伝導体の中で、鉄カルコゲナイド超伝導体（11系）は、最も単純な結晶構造を有する。11系は線材応用上重要となる上部臨界磁場が高く、構成元素の数も少ないため、高磁場下での超伝導線材応用が期待されている。これまでに電気化学合成のみの試料では、電気抵抗測定においてゼロ抵抗を示す試料は得られていなかった。前年度は、基板を溶液に浸した際に、溶液が基板表面に及ぼす影響に着目した。化学量論通りの試料を得るには、浸漬させてからのロスタイムをなくすことが重要であることを見出し、合成直後の試料において、初めてゼロ抵抗を観測することに成功した。本年度は、線材応用を目指す上で、銅酸化物系超伝導線材の下地基板として使用されているRABiTSテープを用いて、良質なFeSe試料が得られる条件の探索を行った。反応時間を5分間に固定し、溶液温度と印加電圧値を様々に変えた際に得られた結果を相図としてまとめた。溶液温度が70、80℃の領域において、結晶性の高いFeSeが得られた。これは、溶液温度を上げることで、電気化学の反応速度が増大し、結晶成長が促進され、より結晶性の良い試料が得られていることを示している。また、EDX測定の結果から、試料の組成比は印加電圧値によって系統的に制御でき、結晶性の良い試料が得られた70℃において、約-1.1 VにおいてFe：Seの比が1：1に近づくことが明らかとなった。さらに、これまでのITO基板と比べ、RABiTSテープを用いた方が、基板自身の標準酸化還元電位の違いから、副反応が起きにくいより低い電圧値で目的相のFeSeが合成できることを見出した。本研究から、電気化学法を用いることで、熱処理を施さずにFeSe超伝導体テープ線材が簡便で安価に作製できる可能性を示している。

Research Progress Status

平成30年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

平成30年度が最終年度であるため、記入しない。

Research Products

• [Journal Article] Influence of Oxidation in Starting Material Sn on Electric Transport Properties of SnSe Single Crystals (2018)
  • Author(s): Yamashita Aichi、Ogiso Osamu、Matsumoto Ryo、Tanaka Masashi、Hara Hiroshi、Tanaka Hiromi、Takeya Hiroyuki、Lee Chul-Ho、Takano Yoshihiko
  • Journal Title: Journal of the Physical Society of Japan Volume: 87 Issue: 6 Pages: 065001-065001
  • DOI: 10.7566/jpsj.87.065001
  • NAID: 120006623967
  • Peer Reviewed / Open Access
• [Journal Article] Local structure of FeSe0.4Te0.6 by low‐temperature x‐ray fluorescence holography (2018)
  • Author(s): J. R. Stellhorn, Y. Ideguchi, K. Kimura, K. Hayashi, N. Happo, M. Suzuki, H. Okazaki, A. Yamashita, Y. Takano, and S. Hosokawa
  • Journal Title: Physica Stutus Solidi B Volume: 255 Issue: 11 Pages: 1800093-1800093
  • DOI: 10.1002/pssb.201800093
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Universal scaling behavior of the upper critical field in strained FeSe0.7Te0.3 thin films (2018)
  • Author(s): Yuan Feifei、Grinenko Vadim、Iida Kazumasa、Richter Stefan、Pukenas Aurimas、Skrotzki Werner、Sakoda Masahito、Naito Michio、Sala Alberto、Putti Marina、Yamashita Aichi、Takano Yoshihiko、Shi Zhixiang、Nielsch Kornelius、Huehne Ruben
  • Journal Title: New Journal of Physics Volume: 20 Issue: 9 Pages: 093012-093012
  • DOI: 10.1088/1367-2630/aade66
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Pressure-Induced Superconductivity in Sulfur-Doped SnSe Single Crystal Using Boron-Doped Diamond Electrode-Prefabricated Diamond Anvil Cell (2018)
  • Author(s): R. Matsumoto, H. Hara, H. Tanaka, K. Nakamura, N. Kataoka, S. Yamamoto, A. Yamashita, S. Adachi, T. Irifune, H. Takeya and Y. Takano
  • Journal Title: J. Phys. Soc. Jpn. Volume: 87 Issue: 12 Pages: 124706-124706
  • DOI: 10.7566/jpsj.87.124706
  • Peer Reviewed / Open Access
• [Journal Article] Single Crystal Growth of Cuprate Superconductor (Lu0.8Nd0.2)Ba2Cu4O8 by KOH Flux Method (2018)
  • Author(s): H. Hara, S. Adachi, R. Matsumoto, A. Yamashita, H. Takeya,and Y. Takano
  • Journal Title: J. Phys. Soc. Jpn. Volume: 87 Issue: 12 Pages: 123705-123705
  • DOI: 10.7566/jpsj.87.123705
  • Peer Reviewed / Open Access
• [Journal Article] Diamond anvil cell using boron-doped diamond electrodes covered with undoped diamond insulating layer (2018)
  • Author(s): R. Matsumoto, A. Yamashita, H. Hara, T. Irihune, S. Adachi, H. Takeya, Y. Takano
  • Journal Title: Appl. Phys. Express Volume: AP180194 Issue: 5 Pages: 053101-053101
  • DOI: 10.7567/apex.11.053101
  • Peer Reviewed / Open Access
• [Journal Article] Observation of zero resistance in as-electrodeposited FeSe (2018)
  • Author(s): A. Yamashita, R. Matsumoto, M. Tanaka, H. Hara, K. Iida, B. Holzapfel, H. Takeya, Y. Takano
  • Journal Title: Solid State Commun. Volume: 270 Pages: 72-75
  • DOI: 10.1016/j.ssc.2017.11.018
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Direct observation of double valence-band extrema and anisotropic effective masses of the thermoelectric material SnSe (2017)
  • Author(s): Takanobu Nagayama, Kensei Terashima, Takanori Wakita, Hirokazu Fujiwara, Tetsushi Fukura, Yuko Yano, Kanta Ono, Hiroshi Kumigashira, Osamu Ogiso, Aichi Yamashita, Yoshihiko Takano, Hitoshi Mori, Hidetomo Usui, Masayuki Ochi, Kazuhiko Kuroki, Yuji Muraoka, Takayoshi Yokoya
  • Journal Title: Japanese Journal of Applied Physics Volume: 57 Issue: 1 Pages: 010301-010301
  • DOI: 10.7567/jjap.57.010301
  • NAID: 210000148501
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] “Phase diagram of FeSe deposited by electrochemical technique with different temperature and voltage (2017)
  • Author(s): A. Yamashita, M. Tanaka, H. Takeya, Y. Takano
  • Journal Title: J. Phys. Soc. Jpn Volume: 86 Issue: 7 Pages: 075001-075001
  • DOI: 10.7566/jpsj.86.075001
  • Peer Reviewed / Open Access
• [Journal Article] Superconducting joints Using Bi-added PbSn Solders (2017)
  • Author(s): R. Matsumoto, H. Iwata, A. Yamashita, H. Hara, G. Nishijima, M. Tanaka, H. Takeya, Y. Takano
  • Journal Title: Appl. Phys. Express Volume: 10 Issue: 9 Pages: 093102-093102
  • DOI: 10.7567/apex.10.093102
  • Peer Reviewed / Open Access
• [Journal Article] The influence of the in-plane lattice constant on the superconducting transition temperature of FeSe0.7Te0.3 thin films (2017)
  • Author(s): Yuan Feifei、Iida Kazumasa、Grinenko Vadim、Chekhonin Paul、Pukenas Aurimas、Skrotzki Werner、Sakoda Masahito、Naito Michio、Sala Alberto、Putti Marina、Yamashita Aichi、Takano Yoshihiko、Shi Zhixiang、Nielsch Kornelius、Huehne Ruben
  • Journal Title: AIP Advances Volume: 7 Issue: 6 Pages: 065015-065015
  • DOI: 10.1063/1.4989566
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Phase-Separation Control of KxFe2－ySe2 Superconductor through Rapid-Quenching Process (2017)
  • Author(s): Y. Yanagisawa, M. Tanaka, A. Yamashita, Suzuki, H. Hara, M. ElMassalami, H. Takeya, and Y. Takano
  • Journal Title: J. Phys. Soc. Jpn. Volume: 86 Issue: 4 Pages: 043703-043703
  • DOI: 10.7566/jpsj.86.043703
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Superconductivity in Iron Chalcogenide Compounds Induced by Battery-Like Reaction (2016)
  • Author(s): A. Yamashita, Y. Takano
  • Journal Title: Journal of the Japan Institute of Metals and Materials Volume: 80 Issue: 7 Pages: 468-472
  • DOI: 10.2320/jinstmet.JC201614
  • NAID: 130005158339
  • ISSN: 0021-4876, 1880-6880, 2433-7501
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Fabrication and Characterization of Sintered Iron-Chalcogenide Superconductors (2016)
  • Author(s): C. Fiamozzi, Corato V, Leo A., De Marzi G, Mancini A., Y. Takano, A. Yamashita, Polichetti M., Galluzzi A., Rufoloni A, Grimaldi G., Pace S.
  • Journal Title: IEEE Trans. Appl. Supercond. Volume: 26 Issue: 3 Pages: 1-5
  • DOI: 10.1109/tasc.2016.2539978
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] X-ray Fluorescence Holographic Study on High-Temperature Superconductor FeSe0.4Te0.6 (2016)
  • Author(s): Yuki Ideguchi, Kenji Kamimura, Koji Kimura, Shinya Hosokawa, Naohisa Happo, Kouichi Hayashi, Yoshihiro Ebisu, Toru Ozaki, Jens R. Stellhorn, Motohiro Suzuki, Hiroyuki Okazaki, Aichi Yamashita, and Yoshihiko Takano
  • Journal Title: Z. Phys. Chem. Volume: 230 Issue: 4 Pages: 489-498
  • DOI: 10.1515/zpch-2015-0671
  • NAID: 120006697255
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Electrochemical Deposition of FeSe on RABiTS Tapes / Electrochemical Deposition of FeSe on RABiTS Tapes (2015)
  • Author(s): 出村郷志,田中将嗣,山下愛智,DENHOLMESaleem James,岡崎宏之,藤岡正弥,山口尚秀,竹屋浩幸,飯田 和昌,Bernhard Holzapfel,坂田英明,高野義彦
  • Journal Title: JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN Volume: 85 Issue: 1 Pages: 015001-015001
  • DOI: 10.7566/jpsj.85.015001
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] FeSeを電着したテープ基板におけるゼロ抵抗の観測 (2018)
  • Author(s): 山下愛智, 松本凌, 原裕, 竹屋浩幸, 高野義彦
  • Organizer: 日本物理学会2018秋季大会
• [Presentation] Electrochemical Synthesis of Iron Chalcogenide Superconductors and Enhancement of Superconducting Property (2018)
  • Author(s): A. Yamashita, Y. Takano
  • Organizer: Tsukuba Global Science Week 2018
• [Presentation] FeSe超伝導体の電気化学合成とゼロ抵抗の観測 (2018)
  • Author(s): A. Yamashita, Y. Takano
  • Organizer: 超伝導分科会 第57回研究会
• [Presentation] Thermoelectric properties of a new Zintl phase NaZn4As3 with ultralow thermal conductivity (2018)
  • Author(s): Aichi Yamashita, Kunihiro Kihou, Haruno Kunioka, Hirotaka Nishiate, Atsushi Yamamoto, Yoshihiko Takano, Chul-Ho Lee
  • Organizer: International Conference on Thermoelectrics ICT2018
  • Int'l Joint Research
• [Presentation] Synthesis of Iron Chalcogenide Superconductors by Electrochemical Reaction (2018)
  • Author(s): A. Yamashita, Y. Takano
  • Organizer: ENN Workshop2018
  • Int'l Joint Research
• [Presentation] FeSeを電着したテープ基板におけるゼロ抵抗の観測 (2018)
  • Author(s): 山下 愛智、高野 義彦
  • Organizer: 超伝導かけはしプロジェクト ワークショップ
• [Presentation] キャリア制御したSnSe単結晶の熱電特性 (2018)
  • Author(s): 山下愛智、 松本凌、原裕、木方邦宏、西当弘隆、李哲虎、田中博美、竹屋浩幸、高野義彦
  • Organizer: 日本物理学会 第73回年次大会
• [Presentation] High Thermoelectric Properties in SnSe Single Crystal (2017)
  • Author(s): A. Yamashita, K. Kihou, H Nishiate, Lee C.H., Y. Takano
  • Organizer: International Union of Materials Research Society
  • Int'l Joint Research
• [Presentation] Observation of Zero Resistance in As-electrodeposited FeSe (2017)
  • Author(s): A. Yamashita, Y. Takano
  • Organizer: European Conference on Applied Superconductivity
  • Int'l Joint Research
• [Presentation] FeSeを電着したテープ基板のゼロ抵抗の観測 (2017)
  • Author(s): 山下 愛智、松本 凌、原 裕、竹屋 浩幸、高野 義彦
  • Organizer: 第78回応用物理学会秋季学術講演会
• [Presentation] キャリア制御したSnSe単結晶の熱電特性 (2017)
  • Author(s): 山下 愛智、松本 凌、原 裕、田中 博美、竹屋 浩幸、高野 義彦
  • Organizer: 第78回応用物理学会秋季学術講演会
• [Presentation] Synthesis and Performance Up of Iron Chalcogenide Superconductors by Electrochemical Technique (2016)
  • Author(s): A. Yamashita, M. Tanaka, K. Suzuki, H. Hara, Y. Yanagisawa, R. Matsumoto, H. Takeya, Y. Takano
  • Organizer: International Workshop on Superconductivity and Related Functional Materials 2016
  • Place of Presentation: National Institute for Materials Science in Sengen, Tsukuba city, Ibaraki, Japan
  • Year and Date: 2016-12-20
  • Int'l Joint Research
• [Presentation] Synthesis and Performance Up of Iron Chalcogenide Superconductors by Electrochemical Technique (2016)
  • Author(s): A. Yamashita, M. Tanaka, Y. Takano
  • Organizer: NIMS WEEK 2016
  • Place of Presentation: 東京国際フォーラム、千代田区、東京都、日本
  • Year and Date: 2016-10-20
• [Presentation] Electrochemical Synthesis of Iron Chalcogenide Superconductors and Enhancement of Superconducting Property (2016)
  • Author(s): A. Yamashita, M. Tanaka, K. Suzuki, H. Hara, Y. Yanagisawa, R. Matsumoto, H. Takeya,and Y. Takano
  • Organizer: Science and Applications of Thin Films, Conference & Exhibition 2016
  • Place of Presentation: Izmir, Turkey
  • Year and Date: 2016-09-19
  • Int'l Joint Research / Invited
• [Presentation] 電気化学的手法による鉄カルコゲナイド超伝導体の合成 (2016)
  • Author(s): 山下愛智, 田中将嗣, 柳沢佑典, 松本凌, 鈴木皓司, 竹屋浩幸, 高野義彦
  • Organizer: 第77回応用物理学会秋季学術講演会
  • Place of Presentation: 朱鷺メッセ、新潟市、新潟県、日本
  • Year and Date: 2016-09-13
• [Presentation] Superconductivty in Iron Chalcogenide compounds induced by Battery-like Reaction (2016)
  • Author(s): A. Yamashita, Y. Takano
  • Organizer: Applied Superconductivity Conference 2016
  • Place of Presentation: Colorado, America
  • Year and Date: 2016-09-04
  • Int'l Joint Research
• [Presentation] Inducement of Superconductivity in FeTe1-xSx by Electrochemical Reaction (2016)
  • Author(s): A. Yamashita, Y. Takano
  • Organizer: Nano Centre Annual Conference 2016
  • Place of Presentation: Adelaide, Australia
  • Year and Date: 2016-06-13
  • Int'l Joint Research