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1999 Fiscal Year Final Research Report Summary

High-resolution angle-resolved photoemission study of electronic structure near the Fermi level in strongly correlated f-electron materials

Research Project

Project/Area Number 10440097
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

TAKAHASHI Takashi  Department of Physics, Tohoku University, Associate Professor, 大学院・理学研究科, 助教授 (00142919)

Co-Investigator(Kenkyū-buntansha) TANAKA Akinori  Department of Physics, Tohoku University, Research Associate, 大学院・理学研究科, 助手 (40250667)
Project Period (FY) 1998 – 1999
Keywordsphotoemission spectroscopy / Fermi surface / strongly correlated electrons / electronic structure / f electrons / superconductors / phase transition
Research Abstract

We have succeeded in performing an energy resolution better than 5 meV by using a new micro-wave excited discharge lamp. With this photoemission spectrometer, we have studied several f- or d-electron correlated materials and obtained the following new findings.
1. We have succeeded in directly observing the change in the Fermi surface topology accompanied with the magnetic phase transition in CeSb. We found that the driving force in the transition is the anisotropic p-f mixing.
2. We found for the first time a temperature dependent small pseudogap at the Fermi level in CeRhAs and CeRhSb. We have ascribed the pseudogap to the Kondo insulator gap formed through the f-d hybridization.
3. We have mapped out the "band structure" of the heavy-fermion superconductors UPtィイD23ィエD2 and URuィイD22ィエD2SiィイD22ィエD2. By comparing with the band calculations, we found that the main body of the valence-band structure consisting of p and d orbitals shows a good agreement between the experiment and the calculation while the bands near EィイD2FィエD2 originating in the f orbital are remarkable narrower in the experiment, probably due to the strong electron correlation.
4. We have mapped out the "band structure" of USb and compared with CeSb. We found that USb is a metal with Fermi surfaces consisting of U6d and U5f electrons in contrast with semimetallic CeSb. We have ascribed this to the difference in the energy position of 4f and 5f levels.
5. We found a pseudogap in Bi2212 high-TィイD2cィエD2 superconductors, which opens at EィイD2FィエD2 above the superconducting transition temperature (TィイD2cィエD2) for various hole concentrations from under to optimal doping. We found two different pseudogaps with different energy scale and temperature dependence ; one is a precursor of the superconducting gap and the other originates in the antiferromagnetic correlation.
6. We have determined the precise Fermi surface of Bi2212 and confirmed its hole-like topology centered at X point.

  • Research Products

    (68 results)

All Other

All Publications (68 results)

  • [Publications] H.Kumigashira: "Spectral Evidence for Pseudogap Formation in Kondo Insulators CeRhAs and CeRhSb"Physical Review Letters. 82. 1943-1946 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kumigashira: "Ultrahigh-Resalution Photoemission Study of Kondo Insulators CeRhAs and CeRhSb"Jpn.J.Appl.Phys.. 11. 91-93 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kumigashira: "High-resolution angle-resolved photoemission study of LaSb"Phys.Rev.B. 58. 7675-7680 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Takahashi: "Magnetic phase transition of CeSb studied by high-resolution angle-resolved photoemission"J.Mag.Mag.Mater.. 177-181. 1027-1028 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Takahashi: "High-resolution angle-resolved photoemission study of CeSb and USb"J.Electron Spectros.Relat.Phenom.. 92. 65-69 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kumigashira: "High-resolution angle-resolved photoemission study of RSb(R=La,Ce,U)"Physica B. 259-261. 1124-1125 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.Chiaia: "Electronic structare of CeSe prabed by resonant photoemission spectroscopy : a test case for the single impurity Anderson Hamiltonian"Physical Review B. 57. 12030-12035 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hyeong-Do Kim: "Surface and bulk 4f photoemission spectra of CeIr_2"Physical Review B. 59. 12294-12297 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kumigashira: "Surface and bulk 4f electronic structure of CeIn_3 and CeSn_3"J.Mag.Mag.Mater.. 177-181. 1035-1036 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.M.Butorin: "Resonant inelastic Soft X-ray scattering at the 4d edge of Ce-based heavy-fermion materials"J.Electron Spectros.Relat.Phenom.. 101-103. 783-786 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Ufuktepe: "Resonant photoemission studies of Thurium monochalcogenides around the Tm 4d threshold"J.Phys.Soc.Jpn.. 67. 2018-2026 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.G.Nath: "4d core-level resonant photoemission spectroscopy of thyeium monochalcogenides around the Tm 3d threshold"J.Electron Spectros.Relat.Phenom.. 88-91. 369-375 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kinoshita: "Resonant photoemission studies of thulium monochalcogenides around the Tm 3d threshold"J.Electron Spectros.Relat.Phenom.. 88-91. 377-384 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Kimura: "4d-4f and 3d-4f resonant photoemission of TmX(X=S,Se,Te)"J.Mag.Mag.Mater.. 177-181. 349-350 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Ito: "High-resolution angle-resolved photoemission study of heavy fermion superconductor UPt_3"Phys.Rev.B. 59. 8923 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Ito: "Angle-resolved photoemission spectroscopy of UPt_3"Physica B. 259-261. 1122-1123 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Ito: "Band Structure and Fermi Surface of URu_2Si_2 studied by high-resolution angle-resolved photoemission spectroscopy"Phys.Rev.B. 60. 13390-13395 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Ito: "High-resolution angle-resolved photoemission study of URu_2Si_2"Jpn.J.Appl.Phys.. 11. 68-70 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sato: "Pseudogap of optimally doped La_<1.85>Sr_<0.15>CuO_4 observed by ultrahigh-resolution photoemission Spectroscopy"Phys.Rev.Lett.. 83. 2254-2257 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Mesot: "Superconducting gap anisotropy and quasiparticle interaction : a doping dependent photoemission study"Phys.Rev.Lett.. 83. 840-843 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.C.Campuzano: "Electronic spectra and their relation to the(π,π)collective mode in high-Tc superconductors"Phys.Rev.Lett.. 83. 3709-3712 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Kaminski: "Quasiparticles in the superconducting states of Bi_2Sr_2CaCu_2O_<8+δ>"Phys.Rev.Lett.. 84. 1788-1791 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.M.Fretwell: "The Fermi surface of Bi_2Sr_2CaCu_2O_8"Phys.Rev.Lett.. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Fujisawa: "Angle-resolved photoemission spectroscopy of SrCuO_2 ; Spin-charge separation?"J.Electron Spectros.Relat.Phenom.. 88-91. 461-465 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Fujisawa: "Spin-charge separation in single-chain compounds Sr_2CuO_3 studied by angle-resolved photoemission"Solid State Commun.. 106. 543-547 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Fujisawa: "Angle-resolved photoemission study of Sr_2CuO_3"Phys.Rev.B. 59. 7358-7361 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sato: "Angle-resolved photoemission study of superconducting ladder compound Sr_<14-x>Ca_<24>O_<41>"J.Phys.Chem.Solids. 59. 1912-1916 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Z.Kurmaev: "Electronic structure of Sr_2RuO_4 : X-ray fluorescence emission study"Phys.Rev.B. 57. 1558-1562 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Yokoya: "Electronic structure of Ce_<1-x>Sr_xTiO_3 : Comparison between substitutional and vacancy doping"Phys.Rev.B. 59. 1815-1818 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] O.Akaki: "Temperature-dependent core-level x-ray photoemission spectroscopy of the organic conductor, (MeCl-PCNQI)_2Cu, (MeBr-DCNQI)_2Cu and(PI-DCNQI)_2Cu"Phys.Rev.B. 57. 11846-11849 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Takahashi: "Two different types of pseudogaps in high-Tc superconductors"J.Phys.Chem.Solids. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sato: "High-resolution angle-resolved photoemission study of Pd-Bi2201"J.Phys.Chem.Solids. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sato: "Small and large pseudogaps in high-Tc superconductors observed by ultrahigh-resolution photoemission spectroscopy"Physica C. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Sato: "Superconducting gas, pseudogap, and Fermi Surface of Bi2201 : high energy-and momentum-resolution photoemission study"Physica C. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H. Kumigashira et al.: "Spectral Evidence for Pseudogap Formation in Kondo Insulators CeRhAs and CeRhSb"Phys. Rev. Lett.. 82. 1943-1946 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Kumigashira et al.: "Ultrahigh-Resolution Photoemission Study of Kondo Insulators CeRhAs and CeRhSb"Jpn. J. Appl. Phys. Series. 11. 91-93 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Kumigashira et al.: "High-resolution angle-resolved photoemission study of LaSb"Phys. Rev.. B 58. 7675-7680 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Takahashi et al.: "Magnetic phase transition of CeSb studied by high-resolution angle-resolved photoemission"J. Mag. Mag. Mater.. 177-181. 1027-1028 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Takahashi et al.: "High-resolution angle-resolved photoemission study of CeSb and USb"J. Electron Spectroscopy and Related Phenomena. 92. 65-69 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Kumigashira et al.: "High-resolution angle-resolved photoemission study of RSb (R=La, Ce, U)"Physica. B 259-261. 1124-1125 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G. Chiaia et al.: "Electronic structure of CeSe probed by resonant photoemission spectroscopy : a test case for the single impurity Anderson Hamiltonian"Phys. Rev. B 57. 12030-12035 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hyeong-Do Kim et al.: "Surface and bulk 4f photoemission spectra of CeIrィイD22ィエD2"Phys. Rev.. B 59. 12294-12297 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Kumigashira et al.: "Surface and bulk 4f electronic structure of CeInィイD23ィエD2 and CeSnィイD23ィエD2"J. Mag. Mag. Mater.. 177-181. 1035-1036 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.M. Butorin et al.: "Resonant inelastic soft-X-ray scattering at the 4d edge of Ce-based heavy-fermion materials"J. Electron Spectroscopy and Related Phenomena. 101-103. 783-786 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Ufuktepe et al.: "Resonant photoemission studies of Thulium monochalcogenides around the Tm 4d threshold"J. Phys. Soc. Jpn.. 67. 2018-2026 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. G. Nath et al.: "4d Core-level resonant photoemission spectroscopy of thylium monochalcogenides around the Tm 3d threshold"J. Electron Spectroscopy and Related Phenomena. 88-91. 369-375 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Kinoshita et al.: "Resonant photoemission studies of thulium monochalcogenides around the Tm 3d threshold"J. Electron Spectroscopy and Related Phenomena. 88-91. 377-384 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Kimura et al.: "4d-4f and 3d-3f resonant photoemission of TmX (X=S, Se, Te)"J. Mag. Mag. Mater. 177-181. 349-350 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Itoh et al.: "High-resolution angle-resolved photoemission study of heavy fermion superconductor UPtィイD23ィエD2"Phys. Rev.. B 59. 8923-8929 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Itoh et al.: "Angle-resolved photoemission spectroscopy of UPtィイD23ィエD2"Physica. B 259-261. 1122-1123 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Itoh et al.: "Band structure and Fermi surface of URuィイD22ィエD2SiィイD22ィエD2 studied by high-resolution angle-resolved photoemission spectroscopy"Phys. Rev.. B 60. 13390-13395 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Itoh et al.: "High-Resolution Angle-Resolved Photoemission Study of URuィイD22ィエD2SiィイD22ィエD2"Jpn. J. Appl. Phys. Series. 11. 68-70 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sato et al.: "Pseudogap of Optimally Doped LaィイD21.85ィエD2SrィイD20.15ィエD2CuOィイD24ィエD2 Observed by Ultrahigh-Resolution Photoemission Spectroscopy"Phys. Rev. Lett. 83. 2254-2257 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Mesot et al.: "Superconducting Gap Anisotropy and Quasiparticle Interactions : A Doping Dependent Photoemission Study"Phys. Rev. Lett. 83. 840-843 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. C. Campuzano et al.: "Electronic spectra and their relation to the(π, π) collective mode in high-Tc superconductors"Phys. Rev. Lett. 83. 3709-3712 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A. Kaminski et al.: "Quasiparticles in the superconducting states of BiィイD22ィエD2SrィイD22ィエD2CaCuィイD22ィエD2OィイD28ィエD2"Phys. Rev. Lett. 84. 1788-1791 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.M. Fretwell et al.: "The Fermi surface of BiィイD22ィエD2SrィイD22ィエD2CaCuィイD22ィエD2OィイD28ィエD2"Phys. Rev. Lett. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Takahashi et al.: "Two different types pseudogaps in high-TィイD2cィエD2 superconductors"J. Phys. Chem. Solids. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sato et al.: "High-resolution angle-resolved photoemission study of Pb-substituted Bi2201"J. Phys. Chem. Solids. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sato et al.: "Small and large pseudogaps in high-TィイD2cィエD2 superconductors observed by ultrahigh-resolution photoemission spectroscopy"Physica C. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sato et al.: "Superconducting gap, pseudogap, and Fermi surface of Bi2201 : High energy- and momentum-resolution photoemission study"Physica C. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Fujisawa et al.: "Angle-resolved photoemission spectroscopy of SrCuOィイD22ィエD2 ; Spin-charge separation?"J. Electron Spectroscopy and Related Phenomena. 88-91. 461-465 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Fujisawa et al.: "Spin-charge separation in single-chain compound SrィイD22ィエD2CuOィイD23ィエD2 studied by angle-resolved photoemission"Solid State Commun.. 106. 543-547 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Fujisawa et al.: "Angle-resolved photoemission study of SrィイD22ィエD2CuOィイD23ィエD2"Phys. Rev.. B 59. 7358-7361 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sato et al.: "Angle-resolved photoemission study of superconducting ladder compound SrィイD214-xィエD2CaィイD2xィエD2CuィイD224ィエD2OィイD241ィエD2"J. Phys. Chem. Solids. 59. 1912-1916 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E. Z. Kurmaev et al.: "Electronic structures of SrィイD22ィエD2RuOィイD24ィエD2 : X-ray fluorescence emission study"Phys. Rev.. B 57. 1558-1562 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Yokoya et al.: "Electronic structure of CeィイD21-xィエD2SrィイD2xィエD2TiOィイD23ィエD2 : Comparison between substitutional and vacancy doping"Phys. Rev.. B 59. 1815-1818 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O. Akaki et al.: "Temperature-dependent core-level x-ray photoemission spectroscopy of the organic conductor, (MeCl-DCNQI)ィイD22ィエD2Cu, (MeBr-DCNQI)ィイD22ィエD2Cu, and (DI-DCNQI)ィイD22ィエD2Cu"Phys. Rev.. B 57. 11846-11849 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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