Dynamical Jahn-Teller Effect due to The p-f Hybridization Effect in f-Electron Systems

2009 Fiscal Year Final Research Report

• Project/Area Number: 19540355
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: IWASA Kazuaki Tohoku University, 大学院・理学研究科, 准教授 (00275009)
• Project Period (FY): 2007 – 2009
• Keywords: 電子-格子相互作用 / p-f混成 / フォノン / 中性子散乱 / X線散乱

Research Abstract

In the basic science field revealing new properties and functions of materials, it is necessary to investigate phase transitions on environmental change like temperature variation. Phase transitions of magnetic state and electrical conductivity accompany often transformations of crystal structures or atomic arrangements. In present study on dynamical behaviors of the material structures, the physical mechanisms of electronic and structural phase transitions was investigated for the compounds with strongly hybridized electrons between rare-earth elements and neighboring atoms.

Research Products

• [Journal Article] Temperature evolution of crystal field splitting in Pr-filled skutterudite (2010)
  • Author(s): K. Iwasa, K. Saito, Y. Murakami, H. Sugawara
  • Journal Title: J.Phys. : Conf.Set. 200 Pages: 012071(4)
  • Peer Reviewed
• [Journal Article] Crystal field excitations in PrFe_4Sb_<12> synthesized under high pressure (2010)
  • Author(s): K. Kuwahara, K. Tanaka, T. Saito, S. Tatsuoka, K. Iwasa, M. Watanabe, Y. Aoki, H. Sato, M. Kohgi, K. Iwasa, H. Sugawara, C. Stock, D. T. Adroja
  • Journal Title: J.Phys. : Conf.Ser. 200 Pages: 012101(4)
  • Peer Reviewed
• [Journal Article] Structural modulation and multipolar ordering in the metal-nonmetal compounds Pr(Ru_<1-x>Rh_x)_4P_<12> (2010)
  • Author(s): C. Laulhe, K. Saito, K. Iwasa, H. Nakao, Y. Murakami
  • Journal Title: J.Phys. : Conf.Ser. 200 Pages: 012102(4)
  • Peer Reviewed
• [Journal Article] Rh-substitution effect on 4f-electron states in multipole ordered phase of PrRu_4P_<12> (2010)
  • Author(s): Kotaro Saito, Claire Laulhe, Kazuaki Iwasa, Youichi Murakami
  • Journal Title: J.Phys. : Conf.Ser. 200 Pages: 012170(4)
  • Peer Reviewed
• [Journal Article] Excitation spectrum of PrOs_4Sb_<12> under a magnetic field (2009)
  • Author(s): S. Raymond, K. Kuwahara, K. Kaneko, K. Iwasa, M. Kohgi, A. Hiess, J. Flouquet, N. Metoki, H. Sugawara, Y. Aoki, H. Sato
  • Journal Title: J.Phys. : Condens.Matter 21 Pages: 215702(5)
  • Peer Reviewed
• [Journal Article] Electronic hybridization effect on 4f electron crystal field states of PrOs_4P_<12> (2009)
  • Author(s): Kazuaki Iwasa, Kotaro Saito, Youichi Murakami, Hitoshi Sugawara
  • Journal Title: Phys.Rev.B 79 Pages: 235113-1-6
  • Peer Reviewed
• [Journal Article] Magnetic octupole ordering in Ce_<0.7>La_<0.3>B_6 : A polarized neutron diffraction study (2009)
  • Author(s): K. Kuwahara, K. Iwasa, M. Kohgi, N. Aso, M. Sera, F. Iga, M. Matsuura, K. Hirota
  • Journal Title: Physica B 404 Pages: 2527-2528
  • Peer Reviewed
• [Journal Article] Crystal field excitations in the filled skutterudite NdOs_4Sb_<12> (2008)
  • Author(s): K. Kuwahara, M. Takagi, K. Iwasa S. Itobe, D. Kikuchi, Y. Aoki, M. Kohgi, H. Sato, H. Sugawara
  • Journal Title: Physica B : Condensed Matter 403 Pages: 903-905
  • Peer Reviewed
• [Journal Article] Inelastic neutron scattering from PrFe_4P_<12> at low temperatures and under high magnetic fields (2008)
  • Author(s): J.-G. Park, D. T. Adroja, K. A. McEwen, M. Kohgi, K. Iwasa
  • Journal Title: Phys.Rev.B 77 Pages: 085102-1-6
  • Peer Reviewed
• [Journal Article] Competition of Magnetic and Quadrupolar Order Parameters in HoB_4 (2008)
  • Author(s): Daisuke Okuyama, Takeshi Matsumura, Takuya Mouri, Naoko Ishikawa, Kenji Ohoyama, Haruhiro Hiraka, Hironori Nakao, Kazuaki Iwasa, Youichi Murakami
  • Journal Title: J.Phys.Soc.Jpn. 77 Pages: 044709-1-4
  • Peer Reviewed
• [Journal Article] Novel Features Realized in the Filled Skutterudite Structure (2008)
  • Author(s): Hideyuki Sato, Daisuke Kikuchi, Kenya Tanaka, Makoto Ueda, Hidekazu Aoki, Tsuyoshi Ikeno, Sho Tatsuoka, Keitaro Kuwahara, Yuji Aoki, Masafumi Kohgi, Hitoshi Sugawara, Kazuaki Iwasa, Hisatomo Harima
  • Journal Title: J.Phys.Soc.Jpn. 77 Pages: 1-6
  • Peer Reviewed
• [Journal Article] Inelastic Neutron Scattering Study of the Heavy Fermion Superconductor PrOs_4Sb_<12> (2008)
  • Author(s): S. Raymond, K. Kuwahara, K. Kaneko, K. Iwasa, M. Kohgi, A. Hiess, M.-A. Measson, J. Flouquet, N. Metoki, H. Sugawara, Y. Aoki, H. Sato
  • Journal Title: J.Phys.Soc.Jpn. 77 Pages: 25-30
  • Peer Reviewed
• [Journal Article] Field Induced Magnetic Moment Distribution in the Ordered Phase of PrFe_4P_<12> (2008)
  • Author(s): Kazuaki Iwasa, Lijie Hao, Youichi Murakami, Masahumi Kohgi, Keitaro Kuwahara, Hitoshi Sugawara, Tatsuma D. Matsuda, Yuji Aoki, Hideyuki Sato, Jean-Michel Mignot, Arson Gukasov
  • Journal Title: J.Phys.Soc.Jpn. 77 Pages: 67-71
  • Peer Reviewed
• [Journal Article] Magnetic Correlation in the Ordered Phase of CeOs_4Sb_<12> (2008)
  • Author(s): Kazuaki Iwasa, Shouhei Itobe, Changping Yang, Youichi Murakami, Masahumi Kohgi, Keitaro Kuwahara, Hitoshi Sugawara, Hideyuki Sato, Naofumi Aso, Takashi Tayama, Toshiro Sakakibara
  • Journal Title: J.Phys.Soc.Jpn. 77 Pages: 318-320
  • Peer Reviewed
• [Journal Article] Spin-Singlet Ground State in the Two-Dimensional Frustrated Triangular Lattice : YbAl_3C_3 (2008)
  • Author(s): Yoshiaki Kato, Masashi Kosaka, Hiromi Nowatari, Yuta Saiga, Atsushi Yamada, Takuya Kobiyama, Susumu Katano, Kenji Ohoyamal, Hiroyuki S. Suzuki, Naofumi Aso, Kazuaki Iwasa
  • Journal Title: J.Phys.Soc.Jpn. 77(No. 5) Pages: 053701
  • Peer Reviewed
• [Journal Article] Magnetic Excitations in Heavy Electron State of Filled Skutterudite Pr_xLa_<1-x>Fe_4P_<12> (x=1.00 and 0.85) (2008)
  • Author(s): Kazuaki Iwasa, Lijie Hao, Tomoo Hasegawa, Kenji Horiuchi, Youichi Murakami, Junya Otsuki, Yoshio Kuramoto, Masahumi Kohgi, Keitaro Kuwahara, Hitoshi Sugawara, Yuji Aoki, Hideyuki Sato
  • Journal Title: J.Phys.Soc.Jpn. 77 Pages: 063706-1-4
  • Peer Reviewed
• [Journal Article] Pr充填スクッテルダイトにおける4f電子多極子秩序と励起 (2008)
  • Author(s): 岩佐和晃, 桑原慶太郎, 神木正史
  • Journal Title: 固体物理 43 Pages: 207-220
  • Peer Reviewed
• [Journal Article] The Unconventional Superconductivity of Skutterudite PrOs_4Sb_<12> : Time-Reversal Symmetry Breaking and Adjacent Field-Induced Quadrupole Ordering (2007)
  • Author(s): Yuji Aoki, Takashi Tayama, Toshiro Sakakibara, Keitaro Kuwahara, Kazuaki Iwasa, Masahumi Kohgi, Wataru Higemoto, Douglas E. MacLaughlin, Hitoshi Sugawara, Hideyuki Sato
  • Journal Title: J.Phys.Soc.Jpn. 76 Pages: 051006-1-13
  • Peer Reviewed
• [Journal Article] Detection of Neutron Scattering from Phase IV of Ce_<0.7>La_<0.3>B_6 : A Confirmation of the Octupole Order (2007)
  • Author(s): Keitaro Kuwahara, Kazuaki Iwasa, Masahumi Kohgi, Naofumi Aso, Masafumi Sera, Fumitoshi Iga
  • Journal Title: J.Phys.Soc.Jpn. 76 Pages: 093702-1-4
  • Peer Reviewed
• [Journal Article] Valence state in R_4As_3 (R=Yb and Eu) studied by resonant and non-resonant X-ray scattering (2007)
  • Author(s): H. Nakao, K. Kiyoto, K. Nakatsuka, D. Bizen, T. Murata, S. Kodama, T. Matsumura, K. Iwasa, Y. Murakami, A. Ochiai
  • Journal Title: J.Phys.Chem.Solids 68 Pages: 2064-2067
  • Peer Reviewed
• [Journal Article] Softening phonon and relaxation mode in the filled skutterudite PrT_4Sb_<12> (T=Ru and Os) (2007)
  • Author(s): K. Iwasa, Y. Mori, L. Hao, Y. Murakami, M. Kohgi, H. Sugawara, H. Sato
  • Journal Title: J.Phys. : Conf.Set. 92 Pages: 012122-1-4
  • Peer Reviewed
• [Presentation] Temperature evolution of crystal field splitting in PrOs_4P_<12> (2009)
  • Author(s): Kazuaki Iwasa, el al.
  • Organizer: The International Conference on Magnetism 2009
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2009-07-31
• [Presentation] Pr充填スクッテルダイトの結晶場励起スペクトルに見られる混成効果 (2009)
  • Author(s): 岩佐和晃, ほか
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 立教大学池袋キャンパス
  • Year and Date: 2009-03-29
• [Presentation] Pr充填スクッテルダイトの結品場励起におけるp-f混成効果 (2008)
  • Author(s): 岩佐和晃, ほか
  • Organizer: 日本中性子科学会第8回年会
  • Place of Presentation: 名古屋大学豊田講堂
  • Year and Date: 2008-12-01
• [Presentation] 希土類化合物におけるフォノン異常と電子格子相互作用 (2008)
  • Author(s): 岩佐和晃, ほか
  • Organizer: 日本物理学会2008年秋季大会
  • Place of Presentation: 岩手大学上田キャンパス
  • Year and Date: 2008-09-20
• [Presentation] Ceモノブニクタイドにおけるp-f混成に基づく動的 Jahn-Teller 効果 (2008)
  • Author(s): 岩佐和晃, ほか
  • Organizer: 日本物理学会2008年第63回年次大会
  • Place of Presentation: 近畿大学本部
  • Year and Date: 2008-03-23
• [Presentation] PrFe_4P_<12>における4f電子の反強的スカラータイプ秩序 (2007)
  • Author(s): 岩佐和晃, ほか
  • Organizer: 日本中性子科学会第7回年会
  • Place of Presentation: 福岡 (九州大学)
  • Year and Date: 2007-11-27
• [Presentation] Magnetic Correlation in the Ordered Phase of CeOs_4Sb_<12> (2007)
  • Author(s): Kazuaki Iwasa, et al.
  • Organizer: International Conference on "New Quantum Phenomena in Skutterudite and Related Systems"
  • Place of Presentation: Kobe Univ.(poster)
  • Year and Date: 2007-09-29
• [Presentation] Field induced magnetic moment distribution in the ordered phase of PrFe_4P_<12> (2007)
  • Author(s): K. Iwasa, et al.
  • Organizer: International Conference on "New Quantum Phenomena in Skutterudite and Related Systems"
  • Place of Presentation: Kobe Univ.
  • Year and Date: 2007-09-28
• [Presentation] CeOs_4Sb_<12>における低エネルギーソフトフォノン (2007)
  • Author(s): 岩佐和晃, ほか
  • Organizer: 日本物理学会2007年第62回年次大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2007-09-21
• [Presentation] Softening Phonon and Relaxation Mode in the Filled Skutterudite PrT_4Sb_<12> (T=Ru and Os) (2007)
  • Author(s): K. Iwasa, et al.
  • Organizer: 12th International Conference on Phonon Scattering in Condensed Matter (PHONONS2007)
  • Place of Presentation: Paris
  • Year and Date: 2007-07-16
• [Remarks] ホームページ
  • URL: http://sheat.phys.tohoku.ac.jp/~iwasa/