A Study on Low Energy Charge Responses of Strongly Correlated Electron Systems by Comprehensive Use of Quantum Beam Spectroscop

2009 Fiscal Year Final Research Report

• Project/Area Number: 19340090
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: YAMADA Kazuyoshi Tohoku University, 原子分子材料科学高等研究機構, 教授 (70133923)
• Co-Investigator(Kenkyū-buntansha): OHOYAMA Kenji 東北大学, 金属材料研究所, 准教授 (60241569) ; FUJITA Masaki 東北大学, 金属材料研究所, 准教授 (20303894) ; HIRAKA Haruhiro 東北大学, 金属材料研究所, 助教 (90323097) ; MIZUKI Junichiro 日本原子力研究開発機構, 量子ビーム応用研究部門, 副部門長 (90354977) ; TOHYAMA Takami 京都大学, 基礎物理学研究所, 教授 (70237056) ; MATSUI Hiroaki 東北大学, 金属材料研究所, 助教 (50431490)
• Co-Investigator(Renkei-kenkyūsha): BARON Alfred Q.R. 理化学研究所, 研究員 ; SHEN Zhi-xun スタンフォード大学, 物理学科, 教授
• Project Period (FY): 2007 – 2009
• Keywords: 中性子ビーム / 強相関電子系 / 磁性 / 中性子散乱 / X線非弾性散乱

Research Abstract

With comprehensive use of several techniques of quantum beam spectroscopy we systematically studied charge and spin excitations or correlations which strongly couple each other in strongly correlated electron systems. These studies revealed dual nature or hierarchy in charge excitations which will provide an important clue to understand the origin of diverse properties in this systems.

Research Products

• [Journal Article] Dual Nature of a Ni Dopant in the Hole-Type La_<2-x>Sr_xCuO_4 Cuprate Superconductor (2009)
  • Author(s): H. Hiraka, D. Matsumura, Y. Nishihata, J. Mizuki, K. Yamada
  • Journal Title: Phys.Rev.Lett. 102 Pages: 037002(1)-037002(4)
  • Peer Reviewed
• [Journal Article] Hidden Quantum Spin-Gap State in the Static Stripe Phase of High-Temperature La_<2-x>Sr_x CuO_4 Superconductors (2009)
  • Author(s): M. Kofu, S.-H. Lee, M. Fujita, H.-J. Kang, H. Eisaki, K. Yamada
  • Journal Title: Phys.Rev.Lett. 102 Pages: 047001(1)-047001(4)
  • Peer Reviewed
• [Journal Article] nergy Gaps in the Failed High-Tc Superconductor La_<1.875>Ba_<0.125>CuO_4 (2009)
  • Author(s): R-H. He, K. Tanaka, S-K. Me, T. Sasagawa, M. Fujita, T. Adachi, N. Mannella, K. Yamada, Y. Koike, Z. Hussain, Z-X. Shen
  • Journal Title: Nature Physics 5 Pages: 119-123
  • Peer Reviewed
• [Journal Article] Charge Excitations in the Stripe-Ordered La_<5/3> Sr_<1/3>NiO_4 and La_<2-x>(Ba,Sr)_x CuO Superconducting Compounds (2009)
  • Author(s): S. Wakimoto, H. Kimura, K. Ishii, K. Ikeuchi, T. Adachi, M. Fujita, K. Kakurai, Y. Koike, J. Mizuki, Y. Noda, K. Yamada, A. H. Said, Yu. Shvyd'ko
  • Journal Title: Phys.Rev.Lett. 102 Pages: 1577001(1)-157001(4)
  • Peer Reviewed
• [Journal Article] q-Dependence of the Giant Bond-Stretching Phonon Anomaly in the Stripe Compound La_<1.48>Nd_<0.4>Sr_<0.12>CuO_4 Measured by IXS (2008)
  • Author(s): D. Reznik, T. Fukuda, D. Lamago, A. Q. R. Baron, S. Tsutsui, M. Fujita, K. Yamada
  • Journal Title: J.Phys.Chem Solids. 69 Pages: 3103-3107
  • Peer Reviewed
• [Journal Article] Momentum-resolved charge excitations in high-Tc cuprates studied by resonant inelastic X-ray scattering (2008)
  • Author(s): K. Ishii, M. Hoesch, T. Inami, K. Kuzushita, K. Ohwada, M. Tsubota, Y. Murakami, J. Mizuki, Y. Endoh, K. Tsutsui, T. Tohyama, S. Maekawa, K. Yamada, T. Masui, S. Tajima, H. Kawashima, J. Akimitsu
  • Journal Title: J.Phys.Chem Solids. 69 Pages: 3118-3124
  • Peer Reviewed
• [Journal Article] Low-Energy Spin Fluctuations in the Ground States of Electron-Doped Pr_<1-x>LaCe-xCuO_<4+δ> Cuprate Superconductors (2008)
  • Author(s): M. Fujita, M. Matsuda, S.-H. Lee, M. Nakagawa, K. Yamada
  • Journal Title: Phys.Rev.Lett. 101 Pages: 107003(1)-107003(4)
  • Peer Reviewed
• [Journal Article] Molecular Spin Resonance in the Geometrically Frustrated Magnet MgCr_2O_4 by Inelastic Neutron Scattering (2008)
  • Author(s): K. Tomiyasu, H. Suzuki, M. Toki, S. Itoh, M. Matsuura, N. Aso, K. Yamada
  • Journal Title: Phys.Rev.Lett. 101 Pages: 177401(1)-177401(4)
  • Peer Reviewed
• [Journal Article] E・ect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO_<1-y> (Ln=La, Nd) (2008)
  • Author(s): C. H Lee, A. Iyo, H. Eisaki, H. Kito, M. Terasa, F. Diaz, T. Ito, K. Kihou, H. Matsuhata, M. Braden, K. Yamada
  • Journal Title: J.Phys.Soc.Jpn 77 Pages: 087304(1)-083704(4)
  • Peer Reviewed
• [Journal Article] Evolution of the Pseudogap Across the Magnet-Superconductor Phase Boundary of Nd_<2-x>Ce_xCuO_4 (2007)
  • Author(s): H. Matsui, T. Takahashi, T. Sato, K. Terashima, H. Ding, T. Uefuji, K. Yamada
  • Journal Title: Phys.Rev.B 75 Pages: 224514(1)-224514(4)
  • Peer Reviewed
• [Journal Article] Ni-Impurity Effects on Incommensurate Spin Correlations in the Superconducting Phase of La_<2-x>Sr_xCuO_4 near the Spin-Glass Phase Boundary (2007)
  • Author(s): H. Hikara, S. Ohta, S. Wakimoto, M. Matsuda, K. Yamada
  • Journal Title: J.Phys.Soc.Jpn. 76 Pages: 074703(1)-074703(6)
  • Peer Reviewed
• [Presentation] Fe-doping effects on magnetism in hole-type superconductors of (Bi,Pb)_2Sr_2CuO_6 (2009)
  • Author(s): H. Hiraka, S. Wakimoto, M. Takeda, K. Kakurai, D. Matsumura, Y. Nhihata, J. Mizuki, K. Yamada
  • Organizer: International Conference on Magnetism (ICM 2009)
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2009-07-27
• [Presentation] Static Spin Correlations hidden behind the superconductivity in La_<2-x>Sr_xCuO_4 (2009)
  • Author(s): M. Fujita, M. Enoki, S. Iikubo, K. Yamada
  • Organizer: Gordon Research Conferences : Superconductivity
  • Place of Presentation: Hong Kong, China
  • Year and Date: 2009-06-08
• [Presentation] 中性子散乱用Ge単結晶モノクロメータの高度化 (2009)
  • Author(s): 三宅悠子, 平賀晴弘, 山口泰男, 大山研司, 山田和芳
  • Organizer: 中性子散乱用Ge単結晶モノクロメータの高度化
  • Place of Presentation: 東京
  • Year and Date: 2009-03-28
• [Presentation] Recent Activities of IMR Neutron Group for Neutron-Monochromator Renovation in JRR-3 (2009)
  • Author(s): H. Hiraka
  • Organizer: 2009 WPI-AIMR Annual Workshop
  • Place of Presentation: 仙台市
  • Year and Date: 2009-03-03
• [Presentation] JRR-3装置群でのモノクロメータ高度化への金研の取り組み (2008)
  • Author(s): 平賀晴弘, 山口泰男, 大山研司, 山田和芳, 宍戸統悦, 戸澤慎一郎, 松浦直人, 佐藤卓, 廣田和馬, 目時直人, 松田雅昌
  • Organizer: 日本中性子科学会第8回年会
  • Place of Presentation: 名古屋市
  • Year and Date: 2008-12-01
• [Patent(Industrial Property Rights)] 中性子線の単色集光装置 (2009)
  • Inventor(s): 平賀晴弘, 山田和芳, 藤原航三
  • Industrial Property Rights Holder: 東北大学
  • Industrial Property Number: 出願特願2009-066185
  • Filing Date: 2009-03-18