High-resolution angle-resolved photoemission study of fine electronic states in electron-doped high-T_c superconductors

2009 Fiscal Year Final Research Report

• Project/Area Number: 20840002
• Research Category: Grant-in-Aid for Young Scientists (Start-up)
• Allocation Type: Single-year Grants
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: RICHARD Pierre Tohoku University, 原子分子材料科学高等研究機構, 助教 (70513828)
• Project Period (FY): 2008 – 2009
• Keywords: 角度分解光電子分光 / 超伝導 / 強相関電子系

Research Abstract

In order to elucidate the origin of superconductivity in high-T_c cuprates, it is indispensable to systematically investigate the electronic states of various superconductors and compare their electronic states with cuprates. Recently-discovered iron-pnictide superconductor is the best candidate to approach this issue. In this research, we have performed high-resolution angle-resolved photoemission spectroscopy of iron-pnictide superconductors and elucidated basic electronic states such as Fermi surface and band structure. In addition, we have directly observed the superconducting gap and established the superconducting pairing symmetry. We also compared the experimental electronic states between the iron pnictides and electron-doped cuprates.

Research Products

• [Journal Article] Angle-resolved photoemission spectroscopy of the Fe-based Ba_<0.6>K_<0.4>Fe_2As_2 high temperature superconductor : evidence for an orbital selective electron-mode coupling (2009)
  • Author(s): P. Richard, T. Sato, K. Nakayama, S. Souma, T. Takahashi, Y.-M. Xu, G. F. Chen, J. L. Luo, N. L. Wang, H. Ding
  • Journal Title: Phys.Rev.Lett. 102 Pages: 047003
  • Peer Reviewed
• [Journal Article] Electronic structure of heavily electron-doped BaFe_<1.7>Co_<0.3>As_2 studied by angle-resolved photoemission (2009)
  • Author(s): Y. Sekiba, T. Sato, K. Nakayama, K. Terashima, P. Richard, J. H. Bowen, H. Ding, Y-M. Xu, L. J. Li, G. H. Cao, Z.-A. Xu, T. Takahashi
  • Journal Title: New J.Phys. 11 Pages: 025020
  • Peer Reviewed
• [Journal Article] Superconducting-gap symmetry of Ba_<0.6>K_<0.4>Fe_2As_2 studied by angle-resolved photoemission spectroscopy (2009)
  • Author(s): K. Nakayama, T. Sato, P. Richard, Y.-M. Xu, Y. Sekiba, S. Souma, G. F. Chen, J. L. Luo, N. L. Wang, H. Ding, T. Takahashi
  • Journal Title: Europhys.Lett. 85 Pages: 67002-1-5
  • Peer Reviewed
• [Journal Article] Observation of Dirac Cone Electronic Dispersion in BaFe_2As_2 (2009)
  • Author(s): P. Richard, K. Nakayama, T. Sato, M. Neupane, Y.-M. Xu, J. H. Bowen, G. F. Chen, J. L. Luo, N. L. Wang, X. Dai, Z. Fang, H. Ding, T. Takahashi
  • Journal Title: Europhys.Lett. 85 Pages: 67002-1-5
  • Peer Reviewed
• [Journal Article] Fermi surface nesting induced strong pairing in iron-based superconductors (2009)
  • Author(s): K. Terashima, Y. Sekiba, J. H. Bowen, K. Nakayama, T. Kawahara, T. Sato, P. Richard, Y.-M. Xu, L. J. Li, G. H. Cao, Z.-A. Xu, H. Ding, T. Takahashi
  • Journal Title: Proc.Natl.Acad.Sci. 106 Pages: 7330-7333
  • Peer Reviewed
• [Journal Article] Observation of a Novel Orbital Selective Mott Transition in Ca_<1.8>Sr_<0.2>RuO_4 (2009)
  • Author(s): M. Neupane, P. Richard, Z.-H. Pan, Y.-M. Xu, R. Jin, D. Mandrus, X. Dai, Z. Fang, Z. Wang, H. Ding
  • Journal Title: Phys.Rev.Lett. 103 Pages: 097001
  • Peer Reviewed
• [Journal Article] Band structure and Fermi surface of an extremely overdoped iron-based superconductor KFe_2As_2 (2009)
  • Author(s): T. Sato, K. Nakayama, Y. Sekiba, P. Richard, Y.-M. Xu, S. Souma, T. Takahashi, G. F. Chen, J. L. Luo, N. L. Wang, H. Ding
  • Journal Title: Phys.Rev.Lett. 103 Pages: 047002
  • Peer Reviewed
• [Journal Article] Evolution of pairing-induced pseudogap from superconducting gap in (Bi,Pb)_2Sr_2CuO_6 (2009)
  • Author(s): K. Nakayama, T. Sato, Y. Sekiba, K. Terashima, P. Richard, T. Takahashi, K. Kudo, N. Okumura, T. Sasaki, N. Kobayashi
  • Journal Title: Phys.Rev.Lett. 102 Pages: 227006
  • Peer Reviewed
• [Journal Article] Evolution of Fermi surface and normal state gap in the chemically substituted cuprates Bi_2Sr_<2-x>Bi_xCuO_<6+d> (2009)
  • Author(s): Z.-H. Pan, P. Richard, Y.-M. Xu, M. Neupane, P. Bishay, A. V. Fedorov, H. Luo, L. Fang, H.-H. Wen, Z. Wang, H. Ding
  • Journal Title: Phys.Rev.B 79 Pages: 092597
  • Peer Reviewed
• [Journal Article] Coexistence of competing orders with two energy gaps in real and momentum space in high-T_c superconductor Bi_2Sr_<2-x>La_xCuO_<6+d> (2008)
  • Author(s): J.-H. Ma, Z.-H. Pan, F. C. Niestemski, M. Neupane, Y.-M. Xu, P. Richard, K. Nakayama, T. Sato, T. Takahashi, H.-Q. Luo, L. Fang, H.-H. Wen, Ziqiang Wang, H. Ding, V. Madhavan
  • Journal Title: Phys.Rev.Lett. 101 Pages: 207002-1-4
  • Peer Reviewed
• [Journal Article] Observation of Fermi-surface-dependent nodeless supercoducting gaps in Ba_<0.6>K_<0.4>Fe_2As_2 (2008)
  • Author(s): H. Ding, P. Richard, K. Nakayama, K. Sugawara, T. Arakane, Y. Sekiba, A. Takayama, S. Souma, T. Sato, T Takahashi, Z. Wang, X. Dai, Z. Fang, G. F. Chen, J. L. Luo, N. L. Wang
  • Journal Title: Europhys.Lett. 83 Pages: 47001-1-4
  • Peer Reviewed
• [Presentation] On the Role of Fermi surface Nesting in the Iron-based Superconductor (2010)
  • Author(s): P. Richard
  • Organizer: WPI-AIMR annual workshop
  • Place of Presentation: 仙台
  • Year and Date: 2010-03-26
• [Presentation] ARPES studies of FeAs-based compounds (2010)
  • Author(s): P. Richard
  • Organizer: American Physical Society March Meeting
  • Place of Presentation: Portland, USA
  • Year and Date: 2010-03-15
• [Presentation] Observation of Dirac Cone Electronic (2010)
  • Author(s): P. Richard
  • Organizer: Dispersion in BaFe_2As_2
  • Place of Presentation: Portland, USA
  • Year and Date: 2010-03-15
• [Presentation] ARPES on the new Fe-based superconductors : year 2 (2009)
  • Author(s): P. Richard
  • Place of Presentation: Lac Carling, Canada
  • Year and Date: 2009-10-23
• [Presentation] Observation of an overdoped surface state in underdoped YBa_2Cu_3O_<6.5> ortho-II (2009)
  • Author(s): P. Richard
  • Organizer: 日本物理学会
  • Place of Presentation: 盛岡大学、岩手県
  • Year and Date: 2009-09-22
• [Presentation] Observation of an orbital-selective electron-mode coupling in Fe-based high-T_c superconductors (2009)
  • Author(s): P. Richard
  • Organizer: 日本物理学会
  • Place of Presentation: 盛岡大学、岩手県
  • Year and Date: 2009-09-22
• [Presentation] On the interplay between superconductivity and magnetism in the iron-pnictide superconductors (2009)
  • Author(s): P. Richard
  • Place of Presentation: 東京大学, 東京都
  • Year and Date: 2009-09-09
• [Presentation] Observation of an orbital-selective electron-mode coupling in Fe-based high-T_c superconductors (2009)
  • Author(s): P. Richard
  • Organizer: 日本物理学会
  • Place of Presentation: 立教大学, 東京都
  • Year and Date: 2009-03-30
• [Presentation] Observation of an orbital-selective electron-mode coupling in Fe-based high-T_c superconductors (2009)
  • Author(s): P. Richard
  • Organizer: American Physical Society March Meeting
  • Place of Presentation: Pittsburgh, USA
  • Year and Date: 2009-03-19
• [Presentation] Band structure and Fermi surface of extremely overdoped iron-based superconductors (2009)
  • Author(s): P. Richard
  • Organizer: American Physical Society March Meeting
  • Place of Presentation: Pittsburgh, USA
  • Year and Date: 2009-03-19
• [Presentation] Electronic structure of the new Fe-based Scs : an ultra-high resolution ARPES investigation (2009)
  • Author(s): P. Richard
  • Organizer: WPI-AIMR annual workshop
  • Place of Presentation: 蔵王, 宮城県
  • Year and Date: 2009-03-05
• [Remarks] ホームページ
  • URL: http://arpes.phys.tohoku.ac.jp