Development of nuclear magnetic resonance under uniaxial pressure

2012 Fiscal Year Final Research Report

• Project/Area Number: 23654120
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: NAKAI Yusuke 首都大学東京, 理工学研究科, 助教 (90596842)
• Project Period (FY): 2011 – 2012
• Keywords: 核磁気共鳴 / 一軸性圧力 / 鉄系超伝導

Research Abstract

Uniaxial pressure is a plausible technique for the revealing of intriguing physical properties in anisotropic materials by the tuning of their interactions anisotropically. In order to investigate the anisotropic nature of the iron-pnictide superconductors, we carried out the development of an NMR technique under uniaxial pressure. We have not clarified the anisotropic nature via the technique due to the breakage of thin single crystals, but obtained important results for the understanding of the iron pnictide superconductivity via NMR under atmospheric and hydrostatic pressure.

Research Products

• [Journal Article] Normal state spin dynamics in the iron-pnictide superconductors BaFe_2(As_1-xPx)_2 and Ba(Fe_1-xCox)_2As_2 probed with NMR measurements (2013)
  • Author(s): Y. Nakai, 他
  • Journal Title: Physical Review B Volume: 87 Pages: 174507
  • DOI: DOI:10.1103/PhysRevB.87.174507
  • Peer Reviewed
• [Journal Article] Gradual suppression of antiferromagnetism in BaFe_2(As_1-xPx)_2: Zero-temperature evidence for a quantum critical point (2012)
  • Author(s): T. Iye, Y. Nakai, 他
  • Journal Title: Physical Review B Volume: 85 Pages: 184505
  • DOI: DOI:10.1103/PhysRevB.85.184505
  • Peer Reviewed
• [Journal Article] Enhanced anisotropic spin fluctuations below tetragonal-to-orthorhombic transition in LaFeAs(O_1-xFx) probed by ^75As and ^139La NMR (2012)
  • Author(s): Y. Nakai, 他
  • Journal Title: Physical Review B Volume: 85 Pages: 134408
  • DOI: DOI:10.1103/PhysRevB.85.134408
  • Peer Reviewed
• [Journal Article] Microscopic Evidence of Direct Coupling between Magnetic and Superconducting Order Parameters in BaFe_2(As_1-xPx)_2 (2012)
  • Author(s): T. Iye, Y. Nakai, 他
  • Journal Title: Journal of the Physical Society of Japan Volume: 81 Pages: 033701
  • DOI: DOI:10.1143/JPSJ.81.033701
  • Peer Reviewed
• [Journal Article] P-concentration dependence of the quasiparticle density of states in BaFe_2(As_1-xPx)_2 (2012)
  • Author(s): T. Iye, Y. Nakai, 他
  • Journal Title: Journal of Physics: Conference Series Volume: 391 Pages: 012127
  • DOI: doi:10.1088/1742-6596/391/1/012127
  • Peer Reviewed
• [Journal Article] NMR Studies on Iron-Pnictide Superconductors : LaFeAs(O_1-xFx) & BaFe_2(As_1-xPx)_2 (2011)
  • Author(s): K. Ishida, Y. Nakai, 他
  • Journal Title: Comptes Rendus Physique Volume: 12 Pages: 515
  • DOI: DOI:10.1016/j.crhy.2011.04.004
  • Peer Reviewed
• [Presentation] BaFe_2(As_1-xPx)_2における磁性-超伝導共存/競合相の磁気応答 (2012)
  • Author(s): 家哲也, 中井祐介, 他
  • Organizer: 日本物理学会2012 年秋季大会
  • Place of Presentation: 横浜国立大学
  • Year and Date: 2012-09-21
• [Presentation] Unconventional Superconductivity Around a Quantum Critical Point in the Iron-Based Superconductor BaFe_2(As_1-xPx)_2 (2011)
  • Author(s): Y. Nakai, 他
  • Organizer: The International Conference on Strongly Correlated Electron Systems (SCES 2011)
  • Place of Presentation: Cambridge, UK
  • Year and Date: 2011-09-02
• [Book] Iron-based Superconductors: Materials, Properties and Mechanisms (2013)
  • Author(s): Kenji Ishida and Yusuke Nakai
  • Total Pages: 522
  • Publisher: Pan Stanford Publishing
• [Remarks]
  • URL: http://www.comp.tmu.ac.jp/nanotube/member/nakai/index.html
• [Remarks] アウトリーチ活動状況, 2012年11月3日、首都大学東京オープンラボに研究室として参加。核磁気共鳴法を用いたデモ実験を担当
• [Remarks] アウトリーチ活動状況, 2012年8月4日に首都大学東京で行われた、オープンユニバーシティ講座「ノーベル賞の物質科学」において講師を担当
• [Remarks] アウトリーチ活動状況, 2011年11月3日に首都大学東京で行われた、小中高生のための科研費プログラムひらめき☆ときめきサイエンス「試してみようサイエンス-ナノを探り、操る物理と化学-」において、研究内容の紹介やデモ実験担当