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2020 Fiscal Year Research-status Report

Study of the high temperature superconductivity of iron-chalcogenide superconductors via combining the micro-structure fabricating and ion-gating technique

Research Project

Project/Area Number 19K14661
Research InstitutionAoyama Gakuin University

Principal Investigator

孫 悦  青山学院大学, 理工学部, 助教 (30824180)

Project Period (FY) 2019-04-01 – 2022-03-31
KeywordsFeSe / superconductivity / gating / micro-fabrication
Outline of Annual Research Achievements

We have successfully fabricated a series of a c-axis lamella by the FIB pick-up technique in high-quality FeSe and FeTe0.6Se0.4 single crystals. With this lamella, we can put contacts along the c-axis, to directly measure the out-of-plane transport properties.The deparing current density (Jc) for FeSe was obtained for both along c axis and in the ab plane. The anisototropy of depairing Jc was also obtained, and find to be consistent to the anisotropy estimetaed from the upper critical field (Hc2). Besides, the resistivity, current-voltage curve, critical current density, upper critical fields, and magnetoresistance with current along c axis were studied.

We have successfully intercalated H+ into the FeSe single crystals by gating technique. The superconudcting transition temperature Tc was found to be enhanced over 40 K. More interesting, a discrete superconducting phase diagram with different Tc steps were observed, which is quite distinct from the dome-shaped phase diagram as established in most superconductors.

We have set up a new low temperature measurmental system with 9 T magnetic field, including a sample probe with rotator. With such system, we succeeded in the transport measurement of the FIB microfabricated samples and the EDL devices under magnetic field with different angles.

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

For crystal fabrication, we have already made thin flakes in Fe(Te,Se) single crystals both along c axis and ab plane. Some transport properties were studied based on these flakes.
For the measuremental system, we have finished setting up the system of 9 T magnetic filed with rotating probe. Some measurements under field with angle reslution have already been performed.
For the gating, we have already successfully intercated the H+ into the FeSe single crystal, and enhanced the Tc over 40 K.

Strategy for Future Research Activity

Based on the systematic measurements above, I will conculde the relation of the band structure and the superconducting gap structure with the Tc increase in the ion-gated Fe(TeSe) compounds, and find out the key factors directly related to the high Tc in FeCh system. Then, I will try to include more research into the micro-structure fabricated EDL devices, such as the nematic state from the in-plan anisotropy, which will provide a new clue to study the relation of nematic order with superconductivity. I will also try to explore the current technique into other systems such as the iron arsenide and topological superconductors. Finally, I will summarize the project and prepare for the application of next project.

Causes of Carryover

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  • Research Products

    (8 results)

All 2021 2020

All Journal Article (5 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 5 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Hydrothermal synthesis and complete phase diagram of FeSe1?xSx?(0?x?1) single crystals2021

    • Author(s)
      Yi Xiaolei、Xing Xiangzhuo、Qin Lingyao、Feng Jiajia、Li Meng、Zhang Yufeng、Meng Yan、Zhou Nan、Sun Yue、Shi Zhixiang
    • Journal Title

      Physical Review B

      Volume: 103 Pages: 144501

    • DOI

      10.1103/PhysRevB.103.144501

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Electronic transport properties and hydrostatic pressure effect of FeSe0.67Te0.33 single crystals free of phase separation2021

    • Author(s)
      Xing Xiangzhuo、Sun Yue、Yi Xiaolei、Li Meng、Feng Jiajia、Meng Yan、Zhang Yufeng、Li Wenchong、Zhou Nan、He Xiude、Ge Jun-Yi、Zhou Wei、Tamegai Tsuyoshi、Shi Zhixiang
    • Journal Title

      Superconductor Science and Technology

      Volume: 34 Pages: 055006~055006

    • DOI

      10.1088/1361-6668/abef4e

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Quantum oscillations and anomalous angle-dependent magnetoresistance in the topological candidate Ag3Sn2020

    • Author(s)
      Zhou Nan、Sun Yue、Xu C. Q.、Xi C. Y.、Wang Z. S.、Li B.、Feng J. J.、Zhang L.、Xing X. Z.、Zhang Y. F.、Pan Y. Q.、Meng Y.、Yi X. L.、Pi L.、Xu Xiaofeng、Shi Zhixiang
    • Journal Title

      Physical Review B

      Volume: 101 Pages: 245102

    • DOI

      10.1103/PhysRevB.101.245102

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Evidence for nematic superconductivity of topological surface states in PbTaSe22020

    • Author(s)
      Le Tian、Sun Yue、Jin Hui-Ke、Che Liqiang、Yin Lichang、Li Jie、Pang Guiming、Xu Chunqiang、Zhao Lingxiao、Kittaka Shunichiro、Sakakibara Toshiro、Machida Kazushige、Sankar Raman、Yuan Huiqiu、Chen Genfu、Xu Xiaofeng、Li Shiyan、Zhou Yi、Lu Xin
    • Journal Title

      Science Bulletin

      Volume: 65 Pages: 1349~1355

    • DOI

      10.1016/j.scib.2020.04.039

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Fully gapped superconductivity without sign reversal in the topological superconductor PbTaSe22020

    • Author(s)
      Sun Yue、Kittaka Shunichiro、Sakakibara Toshiro、Machida Kazushige、Sankar R.、Xu Xiaofeng、Zhou Nan、Xing Xiangzhuo、Shi Zhixiang、Pyon Sunseng、Tamegai Tsuyoshi
    • Journal Title

      Physical Review B

      Volume: 102 Pages: 024517

    • DOI

      10.1103/PhysRevB.102.024517

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Out-of-plane transport property of FeSe single crystal2021

    • Author(s)
      孫悦
    • Organizer
      日本物理学会 第76回年次大会
  • [Presentation] Depairing Jc and its anisotropy of Fe(Te,Se) single crystals2020

    • Author(s)
      孫悦
    • Organizer
      33nd International Symposium on Superconductivity (ISS2020)
    • Int'l Joint Research
  • [Presentation] Achieving the depairing limit along c-axis in Fe(Te, Se) single crystals2020

    • Author(s)
      孫悦
    • Organizer
      日本物理学会 2020年秋季大会

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Published: 2021-12-27  

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