Development of ultrahigh-pressure NMR technique and study of strongly correlated electron systems

2013 Fiscal Year Final Research Report

• Project/Area Number: 24740219
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Kochi University
• Principal Investigator: KITAGAWA Kentaro 高知大学, 教育研究部自然科学系, 講師 (90567661)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Keywords: 核磁気共鳴 / 高圧研究 / 超高圧NMR / 鉄系高温超伝導

Research Abstract

It had been almost impossible to measure magnetism and superconductivity by microscopic probes under ultrahigh pressure over 3GPa in the field of the condensed matter physics. This study aims to develop such a ultrahigh-pressure technique (expanding pressure range and simplifying) and to perform ultrahigh-pressure NMR experiments on several strongly correlated electron systems. The development for "Small high-pressure apparatus for general usage" has been quite successfully performed. Our new wiring setup allows a lot of electrodes and optical fibers to be inserted over 13GPa with high reliability. Namely, our cell become quite useful also for resistivity, ac-susceptibility, and other bulk experiments. In addition, we developed smaller ultrahigh-pressure cell and 3He-circulative fridge for it, which makes ultralow-temperature, ultrahigh-pressure NMR measurement possible.

Research Products

• [Journal Article] Heavy fermion superconductivity under pressure in the quadrupole system PrTi_2Al_<20> (2013)
  • Author(s): K. Matsubayashi, T. Tanaka, J. Suzuki, A. Sakai, S. Nakatsuji, K. Kitagawa, Y. Kubo, Y. Uwatoko
  • Journal Title: JPS Conference Proceedings誌、Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013) Volume: (掲載決定)
  • Peer Reviewed
• [Journal Article] Phase diagram and superconductivity of NaFeAs studied by single-crystal ^75As-NMR under pressure up to 7.3 GPa (2013)
  • Author(s): Kentaro Kitagawa, Yuji Mezaki, Kazuyuki Matsubayashi, Yoshiya Uwatoko, and Masashi Takigawa
  • Journal Title: JPS Conference Proceedings誌、Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013) Volume: (掲載決定)
  • Peer Reviewed
• [Journal Article] Investigation of the superconducting gap structure in SrFe_2(As_<0.7>P_<0.3>)_2 by magnetic penetration depth and flux flow resistivity analysis (2012)
  • Author(s): Hideyuki Takahashi, Tatsunori Okada, Yoshinori Imai, Kentaro Kitagawa, Kazuyuki Matsubayashi, Yoshiya Uwatoko, and Atsutaka Maeda
  • Journal Title: Physical Review B Volume: 86 Pages: 144525-1-5
  • Peer Reviewed
• [Journal Article] 容積効率にこだわった高圧セルによる10 GPa級NMR測定 (2012)
  • Author(s): 北川健太郎、松林和幸、後藤弘匡、松本健彦、上床美也、八木健彦、瀧川仁
  • Journal Title: 高圧力の科学と技術 Volume: 22巻 Pages: 198-205
  • Peer Reviewed
• [Journal Article] Microwave surface-impedance measurements of the electronic state and dissipation of magnetic vortices in superconducting LiFeAs single crystals (2012)
  • Author(s): Tatsunori Okada, Hideyuki Takahashi, Yoshinori Imai, Kentaro Kitagawa, Kazuyuki Matsubayashi, Yoshiya Uwatoko, and Atsutaka Maeda
  • Journal Title: Physical Review B Volume: 86 Pages: 064516-1-5
  • Peer Reviewed
• [Journal Article] Scanning tunneling microscopy/spectroscopy of vortices in LiFeAs (2012)
  • Author(s): T. Hanaguri, K. Kitagawa, K. Matsubayashi, Y. Mazaki, Y. Uwatoko, and H. Takagi
  • Journal Title: Physical Review B Volume: 85 Pages: 214505-1-9
  • Peer Reviewed
• [Presentation] Yb-Co-X新化合物の物性評価とNMR (2014)
  • Author(s): 北川健太郎,岩谷誠,小松健良,西岡孝,岸本恭来,松村政博,真木祥千子,山浦淳一,片山尚幸,澤博,松林和幸,上床美也
  • Organizer: 日本物理学会2014年年次大会
  • Place of Presentation: 東海大学湘南キャンパス(口頭、29pCM-11)
  • Year and Date: 2014-03-29
• [Presentation] 10GPa超級超高圧NMR技術の高圧化・大容積化 (2013)
  • Author(s): 賀来真司、松林和幸、上床美也、北川健太郎
  • Organizer: 第54回高圧討論会
  • Place of Presentation: 朱鷺メッセ, 新潟市(ポスター、2P31)
  • Year and Date: 2013-11-15
• [Presentation] LaRu_2P_2超伝導体のNQR/NMR研究 (2013)
  • Author(s): 北川健太郎、小松健良、西岡孝、藤原哲也、繁岡透
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学常三島キャンパス(口頭、27aEC-12)
  • Year and Date: 2013-09-27
• [Presentation] NMR Study on Pressure-Induced Superconductivity of NaFeAs Single Crystals up to 7 GPa (2013)
  • Author(s): K. Kitagawa, Y. Mezaki, K. Matsubayashi, Y. Uwatoko, and M. Takigawa
  • Organizer: SCES2013 (Strongly Correlated Electron Systems)
  • Place of Presentation: Tokyo(口頭、5 6p I-1-6)
  • Year and Date: 2013-08-06
• [Presentation] 10GPa超級大容積超高圧セルによるNMR技術の開発 (2012)
  • Author(s): 北川健太郎、松林和幸、後藤弘匡、松本健彦、上床美也、八木健彦、瀧川仁
  • Organizer: 第53回高圧討論会
  • Place of Presentation: 大阪大学豊中キャンパス(ポスター、2P40)
  • Year and Date: 2012-11-08
• [Presentation] 10GPa超級高体積超高圧装置の開発によるNMR及びマクロ測定 (2012)
  • Author(s): 北川健太郎、松林和幸、後藤弘匡、松本健彦、上床美也、八木健彦、瀧川仁
  • Organizer: 日本物理学会2012年秋季大会
  • Place of Presentation: 横浜国立大学(ポスター、20pPSB-28)
  • Year and Date: 2012-09-20
• [Remarks]
  • URL: http://www.cc.kochi-u.ac.jp/?kitag/