Electronic properties and structures in multi-orbital strongly correlated system

• Project/Area Number: 22684017
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: ISHIZAKA Kyoko 東京大学, 大学院・工学系研究科, 准教授 (20376651)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥26,520,000 (Direct Cost: ¥20,400,000、Indirect Cost: ¥6,120,000); Fiscal Year 2011: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2010: ¥21,970,000 (Direct Cost: ¥16,900,000、Indirect Cost: ¥5,070,000)
• Keywords: 軌道自由度 / 強相関電子系 / 光電子分光 / 超伝導

Research Abstract

We investigated the electronic structure of multi-orbital systems, which show anomalous electronic properties such as metal-insulator transition, superconductivity, quantum criticality, magnetic order, and spin-splitting induced by spin-orbit interaction. The mechanisms of anomalous and novel physical properties were clarified by means of angular-resolved photoemission spectroscopy using a variety of light sources including synchrotrons and lasers, thus enabling the high-resolution, polarization-dependet, and time-resolved measurements.

Research Products

• [Journal Article] Pseudogap-related charge dynamics in the layered nickelate RNiO4(x~1) (2012)
  • Author(s): M. Uchida, Y. Yamasaki, Y. Kaneko, K.Ishizaka, J. Okamoto, H. Nakao, Y. Murakami,and Y. Tokura
  • Journal Title: Phys.Rev.B Volume: Vol.86,No.16,
• [Journal Article] Three-dimensional bulk band dispersion in polar BiTeI with giant Rashba-type spin splitting (2012)
  • Author(s): M.Sakano,J.Miyawaki, A. Chainani, Y.Takata, T. Sonobe, T. Shimojima, M. Oura, S. Shin, M. S. Bahramy, R. Arita, N. Nagaosa, H. Murakawa,Y. Kaneko, Y. Tokura, and K. Ishizaka
  • Journal Title: Phys. Rev. B Volume: Vol.86, No. 8,
• [Journal Article] Angle-resolved photoemission study on the superconducting iron-pnictides of BaFe2(As, P)2 with low energy photons (2012)
  • Author(s): T. Shimojima, F. Sakaguchi, K. Ishizaka, Y. Ishida, W. Malaeb, T. Yoshida, S. Ideta, A. Fujimori, T. Kiss, M. Okawa, T. Togashi, C. T. Chen, S. Watanabe, Y. Nakashima, A. Ino, H. Anzai, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, S. Kasahara, T. Terashima, T. Shibauchi, Y. Matsuda, M. Nakajima, S. Uchida, K. Kihou, C. H. Lee, A. Iyo, H. Eisaki, A. Chainani, and S. Shin
  • Journal Title: Solid State Communications Volume: Vol.152, No. 8, Pages: 695-700
• [Journal Article] Pseudogap-related charge dynamics in the layered nickelate R2-xSrxNiO4 (x^1) (2012)
  • Author(s): M. Uchida
  • Journal Title: Phys. Rev. B Volume: 86 Issue: 16
  • DOI: 10.1103/physrevb.86.165126
  • Peer Reviewed
• [Journal Article] Angle-resolved photoemission study on the superconducting iron-pnictides of BaFe2(As, P)2 with low energy photons (2012)
  • Author(s): T. Shimojima
  • Journal Title: Solid State Commun. Volume: 152 Issue: 8 Pages: 695-700
  • DOI: 10.1016/j.ssc.2011.12.032
  • Peer Reviewed
• [Journal Article] Three-dimensional bulk band dispersion in polar BiTeI with giant Rashba-type spin splitting (2012)
  • Author(s): M. Sakano
  • Journal Title: Phyiscal Review B Volume: 86 Issue: 8
  • DOI: 10.1103/physrevb.86.085204
  • Peer Reviewed
• [Journal Article] Orbital characters of three-dimensional Fermi surfaces in Eu2-xSrxNiO4 as probed by soft-x- ray angle-resolvedphotoemission spectroscopy (2011)
  • Author(s): M. Uchida, K. Ishizaka, P. Hansmann, X. Yang, M. Sakano, J. Miyawaki, R. Arita, Y. Kaneko, Y. Takata, M. Oura, A. Toschi, K. Held, A. Chainani, O. K. Andersen, S. Shin, and Y. Tokura
  • Journal Title: Phys. Rev. B Volume: Vol.84, No.24,
• [Journal Article] Giant Rashba-type spin splitting in bulk BiTeI (2011)
  • Author(s): K. Ishizaka, M. S. Bahramy, H. Murakawa, M. Sakano, T. Shimojima, T. Sonobe, K. Koizumi,S. Shin, H. Miyahara, A. Kimura, K. Miyamoto, T. Okuda, H. Namatame, M. Taniguchi, R. Arita, N. Nagaosa, K. Kobayashi, Y. Murakami, R. Kumai, Y. Kaneko, Y. Onose, and Y. Tokura
  • Journal Title: Nature Mater. Volume: Vol. 10, No. 7, Pages: 521-526
• [Journal Article] Electronic structure of an antiferromagnetic metal: CaCrO3 (2011)
  • Author(s): P. A. Bhobe, A. Chainani, M. Taguchi, R. Eguchi, M. Matsunami, T. Ohtsuki, K. Ishizaka, M. Okawa, M. Oura, Y. Senba, H. Ohashi, M. Isobe, Y. Ueda, and S. Shin
  • Journal Title: Phys. Rev. B Volume: Vol.83,No.16.
• [Journal Article] Orbital-Independent Superconducting Gaps in Iron-Pnictides (2011)
  • Author(s): T. Shimojima, F. Sakaguchi, K. Ishizaka, Y. Ishida, T. Kiss, M. Okawa, T. Togashi, C.-T. Chen, S. Watanabe, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, K. Ohgushi, S. Kasahara, T. Terashima, T. Shibauchi, Y. Matsuda, A. Chainani, and S. Shin
  • Journal Title: Science Volume: Vol. 332, No. 6029, pp. Pages: 564-567
• [Journal Article] Femtosecond core-level photoemision spectroscopy on1T-TaS2 using a 60 eV laser source (2011)
  • Author(s): K. Ishizaka, T. Kiss, T. Yamamoto, Y. Ishida, T. Saitoh, M. Matsunami, R. Eguchi, T. Ohtsuki, A. Kosuge, T. Kanai, M. Nohara, H. Takagi, S. Watanabe, and S. Shin
  • Journal Title: Phys. Rev. B Volume: Vol. 83, No. 8
• [Journal Article] Pseudogap of Metallic Layered Nickelate R2-xSrxNiO4 (R=Nd,Eu) Crystals Measured Using Angle-Resolved Photoemission Spectroscopy (2011)
  • Author(s): M. Uchida, K. Ishizaka, P. Hansmann, Y. Kaneko, Y. Ishida, X. Yang, R. Kumai, A. Toschi, Y. Onose, R. Arita, K. Held, O. K. Andersen, S. Shin, and Y. Tokura
  • Journal Title: Phys. Rev. Lett. Volume: Vol. 106, No. 2,
• [Journal Article] Orbital-Independent Superconducting Gaps in Iron-Pnictides (2011)
  • Author(s): T.Shimojima, Y.Matsuda, 他18名
  • Journal Title: Science Volume: 332 Issue: 6029 Pages: 564-567
  • DOI: 10.1126/science.1202150
  • Peer Reviewed
• [Journal Article] Orbital characters of three-dimensional Fermi surfaces in Eu2-xSrxNiO4 as probed by soft-x-ray angle-resolved photoemission spectroscopy (2011)
  • Author(s): M.Uchida, et al
  • Journal Title: Physical Review B Volume: 84 Issue: 24 Pages: 2411091-5
  • DOI: 10.1103/physrevb.84.241109
  • Peer Reviewed
• [Journal Article] Giant Rashba-type spin splitting in bulk BiTeI (2011)
  • Author(s): K.Ishizaka
  • Journal Title: Nature Mat. Volume: 10 Issue: 7 Pages: 521-526
  • DOI: 10.1038/nmat3051
  • Peer Reviewed
• [Journal Article] Pseudogap of Metallic Layered Nickelate R_<2-x>Sr_XNiO_4 (R=Nd,Eu) Crystals Measured Using Angle-Resolved Photoemission Spectroscopy (2011)
  • Author(s): M.Uchida, K.Ishizaka, P.Hansmann, Y.Kaneko, Y.Ishida, X.Yang, R.Kumai, A.Toschi, Y.Onose, R.Arita, K.Held, O.K.Andersen, S.Shin, Y.Tokura
  • Journal Title: Physical Review Letters Volume: 106
  • Peer Reviewed
• [Journal Article] Femtosecond core-level photoemision spectroscopy on 1T-TaS2 using a 60-eV laser source (2011)
  • Author(s): K.Ishizaka, T.Kiss, T.Yamamoto, Y.Ishida, T.Saitoh, M.Matsunami, R.Eguchi, T.Ohtsuki, A.Kosuge, T.Kanai, M.Nohara, H.Takagi, S.Watanabe, S.Shin
  • Journal Title: Physical Review B Volume: 83
  • Peer Reviewed
• [Journal Article] Strong valence fluctuation in he quantum critical heavy fermion superconductor-YbAlB4: A hard x-ray photoemission study (2010)
  • Author(s): M. Okawa, M. Matsunami, K. Ishizaka, R. Eguchi, M. Taguchi, A. Chainani, Y. Takata, M. Yabashi, K. Tamasaku, Y. Nishino, T. Ishikawa, K. Kuga, N. Horie, S. Nakatsuji, and S. Shin
  • Journal Title: Phys. Rev. Lett. Volume: Vol. 104, No. 24,
• [Journal Article] Evidence for a correlated insulator to antiferromagnetic metal transition in CrN (2010)
  • Author(s): P. A. Bhobe, A. Chainani, M. Taguchi, T. Takeuchi, R. Eguchi, M. Matsunami, K. Ishizaka, Y. Takata, M. Oura, Y. Senba, H. Ohashi, Y. Nishino, M. Yabashi, K. Tamasaku, T. Ishikawa, K. Takenaka, H. Takagi, and S. Shin
  • Journal Title: Phys. Rev. Lett. Volume: Vol.104, No. 23,
• [Journal Article] Strong valence fluctuation in the quantum critical heavy fermion superconductor beta-YbA1B4 : A hard x-ray photoemission study (2010)
  • Author(s): M.Okawa, M.Matsunami, K.Ishizaka, R.Eguchi, M.Taguchi, A.Chainani, Y.Takata, M.Yabashi, K.Tamasaku, Y.Nishino, T.Ishikawa, K.Kuga, N.Horie, S.Nakatsuji, S.Shin
  • Journal Title: Physical Review Letters Volume: 104
  • Peer Reviewed
• [Presentation] BaFe2(As,P)2 における擬ギャップ" 園 (2012)
  • Author(s): 部竜也、石坂香子 他 20 名
  • Organizer: 日本物理学会
  • Place of Presentation: 横浜国立大学
  • Year and Date: 2012-09-20
• [Presentation] 広い温度領域におけるBa1-xKxFe2As2の電子状態観測 (2012)
  • Author(s): 下志万貴博、石坂香子 他18 名
  • Organizer: 日本物理学会
  • Place of Presentation: 横浜国立大学
  • Year and Date: 2012-09-20
• [Presentation] 極性半導体BiTeI のサブ表面領域におけ る2次元電子構造 (2012)
  • Author(s): 坂野昌人、石坂香子 他10 名
  • Organizer: 日本物理学会
  • Place of Presentation: 横浜国立大学
  • Year and Date: 2012-09-20
• [Presentation] 極性半導体BiTeX(X=Cl,Br,I)における伝導帯の電子構造とスピン分裂 (2012)
  • Author(s): 坂野昌人、石坂香子 他 10 名
  • Organizer: 日本物理学会
  • Place of Presentation: 関西学院大学
  • Year and Date: 2012-03-25
• [Presentation] 極性半導体におけるスピン軌道相互作 用 (2012)
  • Author(s): 石坂香子
  • Organizer: 応用物理学会シンポジウム「スピントロニクス材料の新展開」
  • Place of Presentation: 早稲田大学 (シンポジウム 講演)
  • Year and Date: 2012-03-15
• [Presentation] BaFe2(As,P)2における擬ギャップ (2012)
  • Author(s): 園部竜也
  • Organizer: 日本物理学会
  • Place of Presentation: 横浜国立大学
• [Presentation] 極性半導体における巨大なラシュバ型スピン分裂 (2011)
  • Author(s): 石坂香子
  • Organizer: 放射光表面科学研究部会 「ディラック電子と表面電子状態 」
  • Place of Presentation: タワーホール船堀 (招待講演)
  • Year and Date: 2011-12-16
• [Presentation] 極性半導体BiTeI におけるラシュバ型ス ピン分裂の観測 (2011)
  • Author(s): 石坂香子 他18名
  • Organizer: 日本物理学会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-24
• [Presentation] 空間反転対称性の破れた層状半導体BiTeIの軟X 線角度分解光電子分光 (2011)
  • Author(s): 坂野昌人、石坂 香子 他13名
  • Organizer: 日本物理 会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-24
• [Presentation] レーザー光電子分光によるデツインされたBaFe2As2の電子状態の研究 (2011)
  • Author(s): 園部竜也、石坂香子 他16名
  • Organizer: 日本物理学会
  • Place of Presentation: 富山大学
  • Year and Date: 2011-09-24
• [Presentation] レーザー光電子分光によるデツインされたBaFe2As2の電子状態の研究2 (2011)
  • Author(s): 園部竜也
  • Organizer: 日本物理学会
  • Place of Presentation: 富山大学
• [Presentation] Observation of bulk Rashba-splitting in BiTel (2010)
  • Author(s): K.Ishizaka, H.Murakawa, Y.Kaneko, T.Shimojima, M.Sakano, T.Sonobe, Y.Ishida, S.Shin, T.Okuda, A.Kimura, R.Kumai, M.S.Bahramy, R.Arita, Y.Tokura
  • Organizer: Opening Symposium of QS^2C Theory Forum
  • Place of Presentation: 埼玉県和光市理化学研究所
  • Year and Date: 2010-09-30
• [Book] 十倉好紀「極性半導体における巨大ラシュバ型スピン分裂」 (2012)
  • Author(s): 石坂香子、M. S. Bahramy、村川寛、有田亮太郎、永長直人
  • Publisher: 固体物理 3月号 トピックス Vol.47