Development of Angle-resolved STM Spectroscopy on Organic Superconductors with use of FIB processing

• Project/Area Number: 25610083
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Hokkaido University
• Principal Investigator: Nomura Kazushige 北海道大学, 理学(系)研究科(研究院), 特任教授 (80128579)
• Co-Investigator(Kenkyū-buntansha): NOBUKANE Hiroyoshi 北海道大学, 大学院理学研究院, 助教 (60550663)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: STM分光 / 有機超伝導体 / FIB加工 / 超伝導ギャップ / 異方的超伝導 / 有機超伝導

Outline of Final Research Achievements

In order to determine the symmetry of superconducting gap in the system of the organic superconductors without the cleavage, we developed the method to carry out the angle-resolved STM spectroscopy measurement obtaining the specified crystal surface of single crystal with the FIB processing. We found from the STM observation that the processed surface for the angle-resolved STM spectroscopy should have the surface index with small integers, and established the coverage of this method. In addition, we found that the node direction of the d-wave superconductivity changes with the increase of electron correlation in the organic superconductor system, and obtained the new knowledge for the mechanism of superconductivity.

Research Products

• [Journal Article] Superconducting Phase in λ-(BEDT-STF)2GaCl4 at High Pressures (2015)
  • Author(s): T. Minamidate, Y. Oka, H. Shindo, T. Yamazaki, N. Matsunaga, K. Nomura and A. Kawamoto
  • Journal Title: J. Phys. Soc. Japan Volume: 84 Issue: 6 Pages: 063704-063704
  • DOI: 10.7566/jpsj.84.063704
  • NAID: 210000133570
  • Peer Reviewed / Open Access
• [Journal Article] Tunneling Spectroscopy in Organic Superconductor κ-(BEDT-TTF-d[3,3])2Cu[N(CN)2]Br (2015)
  • Author(s): Y. Oka, H. Nobukane, N. Matsunaga, K. Nomura, K. Katono, K. Ichimura and A. Kawamoto
  • Journal Title: J. Phys. Soc. Japan Volume: 84 Issue: 6 Pages: 064713-064713
  • DOI: 10.7566/jpsj.84.064713
  • NAID: 210000133595
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Charge Order in (TMTTF)2TaF6 by Infrared Spectroscopy (2015)
  • Author(s): Y. Oka, N. Matsunaga, K. Nomura, A. Kawamoto, K. Yamamoto and K. Yakushi
  • Journal Title: J. Phys. Soc. Japan Volume: 84 Issue: 11 Pages: 114709-114709
  • DOI: 10.7566/jpsj.84.114709
  • NAID: 210000133731
  • Peer Reviewed / Open Access
• [Journal Article] STM spectroscopy on deuterated kappa-(ET-d[3,3])2Cu[N(CN)2]Br (2015)
  • Author(s): Y. Oka, H. Nobukane, N. Matsunaga, K. Nomura, K. Katono, K. Ichimura, A. Kawamoto
  • Journal Title: Physica B Volume: 460 Pages: 93-95
  • DOI: 10.1016/j.physb.2014.11.047
  • Peer Reviewed / Open Access
• [Journal Article] Coexistence of Charge Order and Antiferromagnetism in (TMTTF)2SbF6: NMR Study (2015)
  • Author(s): K. Nomura, Y. Yamamoto, N. Matsunaga, S. Hirose, N. Shimohara, T. Satoh, T. Isome, Y. Liu and A. Kawamoto
  • Journal Title: Physica Volume: B460 Pages: 53-57
  • DOI: 10.1016/j.physb.2014.11.039
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Charge ordering and antiferromagnetism in (TMTTF)2SbF6 (2013)
  • Author(s): N. Matsunaga, S. Hirose, N. Shimohara, T. Satoh, T. Isome, M. Yamomoto, Y. Liu, A. Kawamoto, and K. Nomura
  • Journal Title: Phys. Rev. Volume: B 87 Issue: 14
  • DOI: 10.1103/physrevb.87.144415
  • Peer Reviewed
• [Presentation] 有機導体κ-(BEDT-TTF)2Cu[N(CN)2]Brにおける異方的超伝導ギャップ：STM分光 (2016)
  • Author(s): 生松倫太郎、延兼啓純、松永悟明、野村一成、河本充司
  • Organizer: 日本物理学会 第71回年次大会
  • Place of Presentation: 東北学院大学泉キャンパス（宮城県・仙台市）
  • Year and Date: 2016-03-19
• [Presentation] STM spectroscopy on deuterated κ-(ET-d[3,3])2Cu[N(Cn)2]Br (2014)
  • Author(s): Y. Oka, H. Nobukane, N. Matsunaga, K. Nomura, K. Katono, K. Ichimura, A. Kawamoto
  • Organizer: International School and Workshop on Electronic Crystals (ECRYS-2014)
  • Place of Presentation: Institut d’Etudes Scientifiques de Cargese (France)
  • Year and Date: 2014-08-11 – 2014-08-23
• [Presentation] Coexistence of Charge Order and Antiferromagnetism in (TMTTF)2SbF6: NMR Study (2014)
  • Author(s): K. Nomura
  • Organizer: International School and Workshop on Electronic Crystals (ECRYS-2014)
  • Place of Presentation: Institut d’Etudes Scientifiques de Cargese (France)
  • Year and Date: 2014-08-11 – 2014-08-23
  • Invited
• [Presentation] 有機超伝導体κ-(ET)2Cu[N8CN)2]Brの角度分解STM分光 (2014)
  • Author(s): 岡雄基，延兼啓純，松永悟明，野村一成，河本充司，上遠野一広，市村晃一
  • Organizer: 日本物理学会
  • Place of Presentation: 東海大学湘南キャンパス（平塚市）
• [Presentation] Tunneling Spectroscopy on λ-(BETS)2GaCl4 (2013)
  • Author(s): Y. Oka, H. Nobukane, N. Matsunaga, K. Nomura, F. Sultana, A. Kobayashi and H. Kobayashi
  • Organizer: International Workshop on "Phase Transition, Critical Phenomena and Related Topics in Complex Networks"
  • Place of Presentation: 北海道大学（札幌市）
• [Presentation] 有機超伝導体β''-(BEDT-TTF)4[(H3O)Ga(C2O4)3]・C6H5NO2のSTM分光 (2013)
  • Author(s): 高橋周，岡雄基，延兼啓純，松永悟明，野村一成，関春海，井原慶彦，河本充司
  • Organizer: 日本物理学会
  • Place of Presentation: 徳島大学（徳島市）