Photoemission study of photo-induced phase transitions at surfaces of strongly correlated electron systems

2009 Fiscal Year Final Research Report

• Project/Area Number: 19340092
• 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: The University of Tokyo
• Principal Investigator: MIZOKAWA Takashi The University of Tokyo, 大学院・新領域創成科学研究科, 准教授 (90251397)
• Project Period (FY): 2007 – 2009
• Keywords: 強相関電子系 / 光誘起相転移 / 光電子分光 / 光メモリー / 光スイッチ

Research Abstract

We have studied electronic structural changes induced by irradiation of visible and ultraviolet light at surfaces of magnetic or dielectric transition-metal compounds. In particular, we have observed spin and orbital change of electrons in strongly-correlated Mn oxides with complicated spin-charge-orbital orders. We have identified the new electronic states induced by ultraviolet irradiation at surfaces of Ti oxides and opened up new possibility of photo-control of electron spin.

Research Products

• [Journal Article] Valence fluctuations and correlated metallic states in A-site ordered perovskite oxides ACu3V4O12 (A=Na, Ca, and Y) (2010)
  • Author(s): Y. Morita, T. Sudayama, K. Takubo, H. Shiraki, T. Saito, Y. Shimakawa, T. Mizokawa
  • Journal Title: Physical Review B Vol. 81(掲載決定)
  • Peer Reviewed
• [Journal Article] Band structure of the heavily- electron-doped FeAs-based Ba(Fe,Co)_2As_2 superconductor suppresses antiferromagnetic correlations (2010)
  • Author(s): T. Sudayama, Y. Wakisaka, K. Takubo, R. Morinaga, T. J. Sato, M. Arita, H. Namatame, M. Taniguchi, T. Mizokawa
  • Journal Title: Physical Review Letters Vol. 105(掲載決定)
  • Peer Reviewed
• [Journal Article] Photo-Induced In-Gap States in SrTiO_3 Probed by Photoemission Spectroscopy under Ultraviolet Illumination (2010)
  • Author(s): T. Mizokawa, N. Takaiwa, Y. Fujiwara, T. Iida, K. Takubo, J.-Y. Son, T. Ishikawa, M. Itoh, M. Takesada
  • Journal Title: Journal of Physical Society of Japan Vol. 79 Pages: 044703
  • Peer Reviewed
• [Journal Article] Interplay between magnetic impurities and photoinduced carriers in surface depletion layer of anatase Ti_<1-x>Co_xO_<2-δ> thin film probed by x-ray photoemission spectroscopy (2010)
  • Author(s): N. Yamashita, T. Sudayama, T. Mizokawa, Y. Yamada, T. Fukumura, M. Kawasaki
  • Journal Title: Applied Physics Letters Vol. 96 Pages: 021907
  • Peer Reviewed
• [Journal Article] Metallic versus insulating behavior in the A-site ordered perovskite oxides ACu_3Co_4O_<12> (A=Ca and Y) controlled by Mott and Zhang-Rice physics (2009)
  • Author(s): T. Mizokawa, Y. Morita, T. Sudayama, K. Takubo, I. Yamada, M. Azuma, M. Takano, Y. Shimakawa
  • Journal Title: Physical Review B Vol. 80 Pages: 125105
  • Peer Reviewed
• [Journal Article] Bulk-sensitive photoemission study of ACu_3Ru_4O_<12> (A=Ca, Na, and La) with heavy-fermion behavior (2009)
  • Author(s): T. Sudayama, Y. Wakisaka, K. Takubo, T. Mizokawa, W. Kobayashi, I. Terasaki, S. Tanaka, Y. Maeno, M. Arita, H. Namatame, M. Taniguchi
  • Journal Title: Physical Review B Vol. 80 Pages: 075113
  • Peer Reviewed
• [Journal Article] Excitonic Insulator State in Ta_2NiSe_5 Probed by Photoemission Spectroscopy (2009)
  • Author(s): Y. Wakisaka, T. Sudayama, K. Takubo, T. Mizokawa, M. Arita, H. Namatame, M. Taniguchi, N. Katayama, M. Nohara, H. Takagi
  • Journal Title: Physical Review Letters Vol. 103 Pages: 026402
  • Peer Reviewed
• [Journal Article] A Neck-Collapsing-Type Lifshitz Transition Induced by Orbital Symmetry Breaking in Lightly Hole Doped t_<2g> Bands (2009)
  • Author(s): K. Ikedo, Y. Wakisaka, S. Hirata, K. Takubo, T. Mizokawa
  • Journal Title: Journal of Physical Society of Japan Vol. 78 Pages: 063707
  • Peer Reviewed
• [Journal Article] Electronic structure study of triangular lattices in FeGa_2S_4, Fe_2Ga_2S_5, and NiGa_2S_4 : Photoemission spectroscopy and Hartree-Fock calculations (2009)
  • Author(s): K. Takubo, T. Mizokawa, Y. Nambu, S. Nakatsuji
  • Journal Title: Physical Review B Vol. 79 Pages: 134422
  • Peer Reviewed
• [Journal Article] In-gap state and effect of light illumination in CuIr_2S_4 probed by photoemission spectroscopy (2008)
  • Author(s): K. Takubo, T. Mizokawa, N. Matsumoto, S. Nagata
  • Journal Title: Physical Review B Vol. 78 Pages: 245117
  • Peer Reviewed
• [Journal Article] Electronic structure of Ca_3Co_4O_9 studied by photoemission spectroscopy : Phase separation and charge localization (2008)
  • Author(s): Y. Wakisaka, S. Hirata, T. Mizokawa, Y. Suzuki, Y. Miyazaki, T. Kajitani
  • Journal Title: Physical Review B Vol. 78 Pages: 235107
  • Peer Reviewed
• [Journal Article] Electronic Structure of Superconducting and Non-superconducting P_<r2>B_<a4>C_<u7015-δ> Revealed by Photo emission Spectroscopy (2008)
  • Author(s): Y. Wakisaka, K. Takubo, T. Sudayama, J.-Y. Son, T. Mizokawa, M. Arita, H. Namatame, M. Taniguchi, S. Sekiya, K. Fukuda, F. Ishikawa, Y. Yamada
  • Journal Title: Journal of Physical Society of Japan Vol. 77 Pages: 074710
  • Peer Reviewed
• [Journal Article] Photoinduced metal-to-insulator transition in a manganite thin film (2008)
  • Author(s): N. Takubo, I. Onishi, K. Takubo, T. Mizokawa, K. Miyano
  • Journal Title: Physical Review Letters Vol. 101 Pages: 177403
• [Journal Article] Observation of photoinduced phase transition in phase-separated Pr_<0.55>(Ca_<1-y>Sr_y)_<0.45>MnO_3 thin films via x-ray photoemission spectroscopy (2007)
  • Author(s): K. Takubo, J.-Y. Son, T. Mizokawa, N. Takubo, K. Miyano
  • Journal Title: Physical Review B Vol. 75 Pages: 052408
  • Peer Reviewed
• [Journal Article] Unusual superexchange pathways in an NiS_2 triangular lattice with negative charge-transfer energy (2007)
  • Author(s): K. Takubo, T. Mizokawa, J.-Y. Son, Y. Nambu, S. Nakatsuji, Y. Maeno
  • Journal Title: Physical Review Letters Vol. 99 Pages: 037203
  • Peer Reviewed
• [Journal Article] Optical properties of 3d transition-metal- doped MgAl_2O_4 spinels (2007)
  • Author(s): K. Izumi, S. Miyazaki, S. Yoshida, T. Mizokawa, E. Hanamura
  • Journal Title: Physical Review B Vol. 76 Pages: 075111
  • Peer Reviewed
• [Journal Article] Optical response and electronic structure of Zn-doped MgAl_2O_4 (2007)
  • Author(s): K. Izumi, T. Mizokawa, E. Hanamura
  • Journal Title: Journal of Applied Physics Vol. 102 Pages: 053109
  • Peer Reviewed
• [Journal Article] Photoemission Study of Temperature-Induced and Photoinduced Spin-State Transitions in Spin-Crossover Complex [Fe(ptz)_6](BF_4)_2 (2007)
  • Author(s): J.-Y. Son, K. Takubo, D. Asakura, J. W. Quilty, T. Mizokawa, A. Nakamoto, N. Kojima
  • Journal Title: Journal of Physical Society of Japan Vol. 76 Pages: 084703
  • Peer Reviewed
• [Presentation] Orbitally induced spin-charge modulation and pseudogap formation in the high-T_c superconductors (2009)
  • Author(s): T. Mizokawa, T. Sudayama, Y. Wakisaka
  • Organizer: 9th international conference on Materials and Magnetism of superconductivity
  • Place of Presentation: Tokyo, Japan(掲載決定)
  • Year and Date: 2009-09-08
• [Presentation] Local Lattice Distortion and Photo-Induced Phase Transition in Transition-Metal Compounds with Orbital Degeneracy (2008)
  • Author(s): T. Mizokawa, K. Takubo, T. Sudayama, Y. Wakisaka, N. Takubo, K. Miyano, N. Matsumoto, S. Nagata, T. Katayama, M. Nohara, H. Takagi, M. Ikeda, N. Kojima, M. Arita, H. Namatame, M. Taniguchi
  • Organizer: International Conference on Quantum Phenomena in Complex Matter
  • Place of Presentation: Erice, Italy
  • Year and Date: 2008-07-27
• [Presentation] Electronic Structure of LaFeAsO : yz/zx orbital degeneracy and excitonic instability (2008)
  • Author(s): T. Mizokawa, T. Sudayama, Y. Wakisaka
  • Organizer: International Symposium on Fe-Oxipnictide Superconductors
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 2008-06-28
• [Remarks] ホームページ等
  • URL: http://mizokawa.k.u-tokyo.ac.jp