Mechanism of metal-insulator transition clarified by bulk sensitivephotoelectron spectroscopy

2008 Fiscal Year Final Research Report

• Project/Area Number: 18104007
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics I
• Research Institution: Osaka University
• Principal Investigator: SUGA Shigemasa Osaka University, 大学院・基礎工学研究科, 教授 (40107438)
• Co-Investigator(Kenkyū-buntansha): SEKIYAMA Akira 大阪大学, 大学院・基礎工学研究科, 助教 (40294160)
• Co-Investigator(Renkei-kenkyūsha): IMADA Shin 立命館大学, 理工学部, 教授 (90240837) ; YAMASAKI Atsushi 甲南大学, 理工学部, 講師 (50397775) ; TSUNEKAWA Masanori 名古屋大学, 物質科学国際研究センター, 研究員 (20403131) ; YABASHI Makina 理化学研究所, X線自由電子レーザー計画推進本部, 研究員 (00372144) ; OKADA Kouzou 岡山大学, 大学院・自然科学研究科, 准教授 (70194355)
• Project Period (FY): 2006 – 2008
• Keywords: 軟X線角度分解光電子分光 / バルク3次元フェルミオロジー / 強相関電子系 / 硬X線光電子分光 / 光電子recoil効果 / 近藤格子効果 / 極低エネルギー超高分解能光電子分光

Research Abstract

電子相関の強い物質系のバルク電子状態を光電子分光で探るには硬X線の利用が最も有効である。我々は8keVの光を用いて温度を変えることで金属-絶縁体転移を起こすV酸化物を中心に、その機構を解明することに成功した。

Research Products

• [Journal Article] Hard X-ray Photoelectron Spectroscopy of Correlated Electron Systems and Recoil Effects in Photoelectron Emission (2009)
  • Author(s): S.Suga and A.Sekiyama
  • Journal Title: Euro. Phys. J 169 Pages: 227-235
• [Journal Article] Do all nuclei recoil on photoemission in compounds? (2009)
  • Author(s): S.Suga, A.Sekiyama, H.Fujiwara, T. Miyamachi, Y.Nakatsu, S.Imada, P.Baltzer, S.Niitaka, H.Takagi, K.Yoshimura, M.Yabashi, K.Tamasaku, A.Higashiya, T.Ishikawa
  • Journal Title: New J. Phys (in press)
• [Journal Article] Electronic Structure of Nd_<2-x>Ce_xCuO_4 and La_<2-x>S_rxCuO_4 Deduced from Cu 2p Photoemission and Photoabsorption (2009)
  • Author(s): K.Okada
  • Journal Title: J. Phys. Soc. Jpn Vol. 78 Pages: 034725
• [Journal Article] Band Jahn-Teller Instability and Formation of Valence Bond Solid in a Mixed-Valent Spinel Oxide LiRh_2O_4 (2008)
  • Author(s): Y. Okamoto, S. Niitaka, M. Uchida, T. Waki, M. Takigawa, Y. Nakatsu, A. Sekiyama, S. Suga, R. Arita, and H. Takagi
  • Journal Title: Phys. Rev. Lett 101 Pages: 086404
• [Journal Article] Potential and restriction of high resolution, high energy photoemission in 400-8,000 eV for studying strongly correlated electron systems (2008)
  • Author(s): S. Suga
  • Journal Title: Appl. Phys. A, Appl. Phys A 92 Pages: 479-485
• [Journal Article] Ultra-high resolution VUV light source system for extremely low energy photoelectron spectroscopy (2008)
  • Author(s): G. Funabashi, H. Fujiwara, A. Sekiyama, M. Hasumoto, T. Itoh, S. Kimura, P. Baltzer and S. Suga
  • Journal Title: Jpn. J. Appl. Phys 47 Pages: 2265-2269
• [Journal Article] Stability of Electronic States across Metal-Insulator Transition in PrRu_4P_12 (2008)
  • Author(s): A.Yamasaki, S.Imada, A.Sekiyama, H. Fujiwara, M.Yano, J.Yamaguchi, G. Funabashi, H.Sugawara, D.Kikuchi, H.Sato, T.Muro, A.Higashiya, M.Yabashi, T. Ishikawa, H.Harima and S. Suga
  • Journal Title: Phys. Rev B 77 Pages: 16512
• [Journal Article] Reply to "Comment on"Evidence for strong electronic correlations in the spectra of Sr_2RuO_4 (2008)
  • Author(s): Z.V.Pchelkina, I.A.Nekrasov, Th.Pruschke, S.Suga, V.I.Anisimov, and D.Vollhardt
  • Journal Title: Phys. Rev B 77 Pages: 046102-1-3
• [Journal Article] Electronic structures of CeRu_2X_2(X=Si, Ge)in the paramagnetic phase by soft x-ray ARPES and hard x-ray photoemission (2008)
  • Author(s): M.Yano, A.Sekiyama, H.Fujiwara, Y.Amano, S.Imada, T.Muro, M.Yabashi, K.Tamasaku, A.Higashiya, T.Ishikawa, Y.Onuki and S. Suga
  • Journal Title: Phys.Rev B 77 Pages: 035118-1-8
• [Journal Article] Reduction of Kondo lattice effects in Yb_<1-x>Lu_xAl_3 observed by soft x-ray photoemission spectroscopy (2007)
  • Author(s): J.Yamaguchi, A.Sekiyama, S.Imada, A.Yamasaki, M.Tsunekawa, T.Muro, T. Ebihara, Y.Onuki and S.Suga
  • Journal Title: New Jour. Phys 9 Pages: 317-1-10
• [Journal Article] Soft X-ray spectroscopy of possibly heavy fermion compound NdOs_4Sb_12 (2007)
  • Author(s): S.Imada, H.Higashimichi, A.Yamasaki, M.Yano, T.Muro, A.Sekiyama, S.Suga, H. Sugawara, D.Kikuchi, and H.Sato
  • Journal Title: Phys. Rev B76 Pages: 153106-1-4
• [Journal Article] Electron correlation and the metal-insulator transition of the pyrochlore molybdates R_2Mo_2O_7(R=Nd, Sm, Gd, Tb, Y) (2007)
  • Author(s): A.Higashiya, S.Imada, A.Yamasaki, A. Irizawa, A.Sekiyama, S.Suga, Y.Taguchi, M.Iwama, K.Ohgushi, and Y.Tokura
  • Journal Title: Phys. Rev B75 Pages: 155106-1-7
• [Journal Article] Evidence for strong electronic correlation in the spectra of Sr_2RuO_4 (2007)
  • Author(s): Z.V.Pchelkina, I.A.Nekrasov, Th.Prusschke, A. Sekiyama, S.Suga, V.I.Anisimov and D.Vollhardt
  • Journal Title: Phys. Rev B75 Pages: 035122-1-10
• [Journal Article] Coexistence of strongly mixed valency and heavy-fermion character in SmOs_4Sb_12 studied by soft and hard x-ray spectroscopy (2007)
  • Author(s): A.Yamasaki, S.Imada, H.Higashimichi, H.Fujiwara, T.Saita, T.Miyamachi, A.Sekiyama, H.Sugawara, D.Kikuchi, H.Sato, A.Higashiya, M.Yabashi, K.Tamasaku, D.Miwa, T.Ishikawa and S.Suga
  • Journal Title: Phys. Rev. Lett 98 Pages: 156402-1-4
• [Journal Article] M.Yano, A.Sekiyama, H.Fujiwara, T.Saita, S.Imada, Y.Onuki and S.Suga (2007)
  • Author(s): Three-dimensional bulk fermiology of CeRu_2Ge_2 in the paramagnetic phase by soft x-ray hvdependent (700-860 eV) ARPES
  • Journal Title: Phys. Rev. Lett 98 Pages: 036405-1-4
• [Journal Article] Momentum-Specified Oxygen K Resonant Inelastic X-ray Scattering for Cuprates (2007)
  • Author(s): K. Okada and A. Kotani
  • Journal Title: J. Phys. Soc. Jpn Vol. 76 Pages: 123706
• [Journal Article] Static versus dynamical mean-field theory of Mott antiferromagnets (2006)
  • Author(s): F. Sangiovanni, A.Toschi, E. Koch, K. Held, M. Capone, C. Castellani, O. Gunnarson, S.-K. Mo, J. W. Allen, G.-D. Kim, A. Sekiyama, A. Yamasaki, S. Suga and P. Metcalf
  • Journal Title: Phys. Rev B 73 Pages: 205121-1-5
• [Journal Article] Bulk-sensitive photoemission study of(V^<1-x>M_x)_2O_3(M=Cr, Ti) (2006)
  • Author(s): S.-K. Mo, H.-D. Kim, J. D. Denlinger, J. W. Allen, J.-H. Park, A.Sekiyama, A. Yamasaki, S. Suga, Y. Saitoh, T. Muro, and P. Metcalf
  • Journal Title: Phys. Rev B 74 Pages: 165101-1-12
• [Journal Article] Agreement of Luttinger Liquid signatures in bulk and surface sensitive ARPES spectra of Li_<0.9>Mo_6O_17 (2006)
  • Author(s): E.Wang, S.-K.Mo, J.W.Allen, H.-D.Kim, J.He, R.Jin, D.Mandrus, A.Sekiyama, M.Tsunekawa and S.Suga
  • Journal Title: Phys. Rev B 74 Pages: 113107-1-4
• [Journal Article] Copper K and Oxygen K Resonant Inelastic X-ray Scattering of one-dimensional cuprates (2006)
  • Author(s): K. Okada and A. Kotani
  • Journal Title: J.Phys.Soc.Jpn 75 Pages: 044702
• [Journal Article] Oxygen 1s Core-Level Photoemission as a Tool to Investigate the Unoccupied Electronic States of Cuprates (2006)
  • Author(s): K. Okada and A. Kotani
  • Journal Title: J.Phys.Soc.Jpn 75 Pages: 123703
• [Presentation] 2次元的電気伝導を示すペロブスカイト型Mn酸化物のバルク敏感光電子分光 (2009)
  • Author(s): 杉山浩史, 関山明, 菅滋正
  • Organizer: 日本物理学会第64回年次大会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-27
• [Presentation] HAXPES of strongly correlated materials : Yb, Sm, and V compounds and presence or absence of recoil effects in some V compounds (2008)
  • Author(s): S.Suga
  • Organizer: Hard X-ray Photoemission Workshop
  • Place of Presentation: U.S.A
  • Year and Date: 2008-10-14
• [Presentation] 重い電子系CeRu2Si2の軟X線角度分解光電子分光によるバンド構造の温度変化 (2008)
  • Author(s): 矢野正雄, 関山明, 今田真, 室隆桂之, 大貫惇陸, 菅滋正
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2008-09-22
• [Presentation] Eu<1-x>Sm_xB6の硬X線光電子分光 (2008)
  • Author(s): 山口淳一, 関山明, 今田真, 石川哲也, 菅滋正
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-21
• [Presentation] V_nO_<2n-1>マグネリ相バナジウム酸化物に対する硬X線光電子分光 (2008)
  • Author(s): 尾原誠明, 関山明, 今田真, 東谷篤志, 石川哲也, 菅滋正
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-21
• [Presentation] LiV_2O_4の硬X線及び軟X線光電子分光 (2008)
  • Author(s): 中津嘉隆, 関山明, 藤原秀紀, 矢橋牧名, 菅滋正
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 岩手大学
  • Year and Date: 2008-09-21
• [Presentation] Au(001)上bcc Co薄膜のSTM/STS観察 (2008)
  • Author(s): 宮町俊生, 今田真, 川越毅, Fan-Hsiu Chang, 菅滋正
  • Organizer: 日本物理学会第62回年次大会
  • Place of Presentation: 北海道大学
  • Year and Date: 2008-09-21
• [Presentation] Hard X-ray photoelectron spectroscopy of correlated electron systems and recoil effects in core and valence photoelectron emission (2008)
  • Author(s): S. Suga
  • Organizer: Int.Conf.X-ray Spectroscopy
  • Place of Presentation: Paris, France
  • Year and Date: 2008-06-25
• [Presentation] Ca_<1.5>Sr_<0.5>RuO_4の硬X線光電分光 : Ca置換がバルク電子状態に与える影響 (2008)
  • Author(s): 辻林真寛, 関山明, 前野悦輝, 菅滋正
  • Organizer: 日本物理学会第63回年次大会
  • Place of Presentation: 近畿大学
  • Year and Date: 2008-03-23
• [Presentation] Genuine bulk electronic structures of ruthenates, cuprates, manganites and vanadates revealed by high energy photoelectron spectroscopy (2008)
  • Author(s): S. Suga
  • Organizer: German Physical Society Meeting
  • Place of Presentation: Berlin, Germany
  • Year and Date: 2008-02-27
• [Presentation] Three dimensional Fermiology by soft X-ray ARPES and hard X-ray photoelectron spectroscopy of transition metal- and rare earth-compounds (2007)
  • Author(s): S. Suga
  • Organizer: 2^<nd> Int. Workshop on Materials Science and Nano-Engineering
  • Place of Presentation: Yumebutai, Japan
  • Year and Date: 2007-12-02
• [Presentation] Potential and restriction of high resolution high energy photoemission in 400-8,000 eV for studying correlated electron systems, 15th Int. Conf (2007)
  • Author(s): S. Suga
  • Organizer: Vacuum Ultraviolet Radiation Phys
  • Place of Presentation: Berlin, Germany
  • Year and Date: 2007-08-01
• [Presentation] High Energy and High Resolution Photoelectron Spectroscopy in the Hard and Soft X-ray Regions to probe Genuine Bulk Electronic Structures of Strongly (2006)
  • Author(s): S. Suga
  • Organizer: Correlated Electron Systems, 10^<th> Int. Conf. on Electronic Spectroscopy and Structure
  • Place of Presentation: Iguassu, Brazil
  • Year and Date: 2006-08-29
• [Remarks] (1) 本研究は新しい光電子分光技術の開拓によって担保される側面が大きいが, 研究代表者はその開拓への貢献つまり科学技術の基礎研究での功績により第26回島津賞を受賞している。1.日本経済新聞2006年12月8日2.京都新聞2006年12月8日3.日刊工業新聞2006年12月8日
• [Remarks] (2) また本研究者らの開発した軟X線角度分解光電子分光による3次元フェルミオロジーに昨今世界的注目が高まっている。1.朝日新聞2007年2月2日2.読売新聞2007年1月5日
• [Remarks] (3) これらの功績は国際的に高く評価され、研究代表者は日本人として初めて、ドイツの国際的な賞であるHelmholtz-Humboldt研究賞を受賞した。1.読売新聞2008年6月30日朝刊2.日経産業新聞2008年6月23日朝刊
• [Remarks]
  • URL: http://decima.mp.es.osaka-u.ac.jp/japanese/index.html
• [Patent(Industrial Property Rights)] 表面原子可視化装置 (2007)
  • Inventor(s): 関山明, 菅滋正
  • Industrial Property Rights Holder: 国立大学法人大阪大学
  • Industrial Property Number: 特許権特願2007-00523
  • Filing Date: 2007-01-12
• [Patent(Industrial Property Rights)] 超高分解能希ガス光源 (2006)
  • Inventor(s): 菅滋正
  • Industrial Property Rights Holder: 国立大学法人大阪大学
  • Industrial Property Number: 特許権特願2006-253181
  • Filing Date: 2006-09-19