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Filling control and Mott transitin in 3d transition metal oxides

Research Project

Project/Area Number 06452055
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionUniversity of Tokyo

Principal Investigator

TOKURA Yoshinori  Dept, of Applied Physics, University of Tokyo, Professor, 大学院・工学系研究科, 教授 (30143382)

Co-Investigator(Kenkyū-buntansha) ARIMA Takahisa  Dept.of Applied Physics, University of Tokyo, Research Associate, 大学院・工学系研究科, 助手 (90232066)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥7,300,000 (Direct Cost: ¥7,300,000)
Fiscal Year 1995: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1994: ¥5,000,000 (Direct Cost: ¥5,000,000)
KeywordsMott insulator / Filling control / Metal-insulator transition / Electron correlation / Perovskite-type titanium oxide / Perovskite-type vanadium oxide / Perovskite-type nickel oxide / Optical spectroscopy / 金属絶縁体転移 / ギャップ内状態
Research Abstract

(1) Optical spectra have been systematically investigated for R_<1-x>Ca_xTiO_3 with various rare earth ions R (=La, Pr, Nd, Sm, and Y) as a typical three-dimensional correlated electron system , in which both the electron-correlation strength (U/W) and the band filling (n) can be varied by means of changes of R and Ca concentrasion X,respectively. With a decrease of n from 1, the spectrum of the Mott-gap excitation collapses and the Drude part evolves. We found that the rate of the Drude-part evolution with the nominal hole-doping level delta (=1-n) is critically enhanced as U/W approaches the critical value (U/W)_c for the band width-control Mott transition.
(2) Changes in electrical magnetic, and optical properties have been investigated for the doping-induced insulator-metal (I-M) transition in La_<1-x>Sr_xVO_<3'> where the end compound LaVO_3 is a 3d^2 Mott insulator. In the optical spectra, the I-M transition is characterized by doping-induced transfer of spectral weight into the i … More n-gap region. Resistivity in the metallic phase near the critical magnetic phase boundary shows such a temperature dependence as expressed by the relation rho=rho+AT^<1.5> over a wide temperature range (2-200K) with the enhanced coefficient A towards the phase boundary Such resultsccan be explained in terms of the effect of the antiferromagnetic spin fluctuation on the charge transport.
(3) RNiO_3 has the Ni^<3+> ion in the 3d^7configuration with low-spin state (i.e., spin 1/2). and shows metallic or insulating behavior depending on the ionic rarius of the R,as is similar to the case of RTiO_<3'> We investigated optical spectra of this system at room temperature, and found spectral weight transfer over a wide energy range (up to several eV) with the changes of R.We also measured the optical spectrum under variation of temperature for NdNiO_<3, > which undergoes a phase transition from a paramagnetic metal to an antiferromagnetic insulator at 200K,and found the opening of a charge gap below 200K as well as the redistribution of the missing spectral weight over the energy range above 0.3 eV. Less

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (65 results)

All Other

All Publications (65 results)

  • [Publications] T. Katsufuji: "Anomalous variation of phonon Raman intensities near the metal-to-Mott-insulator transition in titanium oxide system" Physical Review B. 50. 2704-2707 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K. Kumagai: "Enhanced carrier mass near the metal-insulator transition in La_<1-x>Sr_xTiO_3 and Y_<1-x>Ca_xTiO_3" Physica C. 199&200. 628-630 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Tokura: "Giant magnetotransport phenomena in filling-controlled Kondo lattice system : La_<1-x>Sr_xMnO_3" Journal of the Physical Society of Japan. 63. 3931-3935 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y. Moritomo: "Magnetic and electronic properties in hole doped manganese oxides with layered structure La_<1-x>Sr_<1+x>MnO_4" Physical Review B. 51. 3297-3300 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A. Asamitsu: "A structural phase transition induced by an external magnetic field" Nature. 373. 407-409 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T. Katsufuji: "Optical spectroscopy of the metal-insulator transition in NdNiO_3" Physical Review B. 51. 4830-4835 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y. Okimoto: "Optical spectra in (La, Y) TiO_3 : Variation of Mott-Hubbard gap features with change of electron correlation and band filling" Physical Review B. 51. 9581-9588 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A. Urushibara: "Insulator-metal transition and giant magnetoresistance in La_<1-x>Sr_xMnO_3" Physical Review B. 51. 14103-14109 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y. Moritomo: "Pressure effect on the double-exchange ferromagnet La_<1-x>Sr_xMnO_3: 0.15≦x≦0.5" Physical Review B. 51. 16491-16494 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y. Tomioka: "Collapse of charge-ordered state under a magnetic field in Pr_<1/2>Sr_<1/2>MnO_3" Physical Review Letters. 74. 5108-5111 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S. Yamaguchi: "Magnetoresistance in metallic crystals of La_<1-x>Sr_xCoO_3" Journal of the Physical Society of Japan. 64. 1885-1888 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y. Okimoto: "Anomalous variation of optical spectra with spin polarization in double-exchange ferromagnet : La_<1-x>Sr_xMnO_3" Physical Review Letters. 75. 109-112 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] F. Inaba: "Change of electronic peoperties of the doping-induced insulator-metal transition in La_<1-x>Sr_xVO_3" Physical Review B. 52. R2221-R2224 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T. Arima: "Optical study of electronic structure in perovskite-type RMO_3(R=La, Y ; M=Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu)" Journal of the Physical Society of Japan. 64. 2488-2501 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H. Yoshizawa: "Neutron-diffraction study of the magnetic-field-induced metal-insulator transition in Pr_<0.7>Ca_<0.3>MnO_3" Physical Review B. 52. R13145-R13148 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T. Katsufuji: "Spectral weight transfer of the optical conductivity in doped Mott insulators" Physical Review Letters. 75. 3497-3500 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H. Kuwahara: "A first-order phase transition induced by a magnetic field" Science. 270. 961-963 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y. Tomioka: "Anomalous magnetotransport properties of Pr_<1-x>Ca_xMnO_3" Journal of the Physical Society of Japan. 64. 3626-3630 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y. Moritomo: "Electronic structure of layered perovskite LaSrMO_4" Journal of the Physical Society of Japan. 64. 4117-4120 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T. Katsufuji: "In-plane and out-of-plane optical spectra of Sr_2RuO_4" Physical Review Letters. 76. 126-129 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S. Yamaguchi: "Spin-state transition and high-spin polarons in LaCoO_3" Physical Review B. (印刷中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Katsufuji et al.: "Anomalous variation of phonon Raman intensities near the metal-to-Mott-insulator transition in titanium oxide system" Physical Review B. 50. 2704-2707 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Kumagai et al.: "Enhanced carrier mass near the metal-insulator transition in La_<1-X>Sr_xTiO_3 and Y_<1-x>Ca_xTiO_3" Physica C. 199&200. 628-630 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Tokura et al.: "Giant magnetotransport phenomena in filling-controlled Kondo lattice system : La_<1-x>Sr_xMnO_3" Journal of the Physical Society of Japan. 63. 3931-3935 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Moritomo et al.: "Magnetic and electronic properties in hole doped manganese oxides with layred structure La_<1-x>Sr_<1+x>MnO_4" Physical Review B. 51. 3297-3300 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A.Asamitsu et al: "A structural phase transition in induced by an external magnetic field" Nature. 373. 407-409 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Katsufuji et al.: "Optical spectroscopy of the metal-insulator transition in NdNiO_3" Physical Review B. 51. 4830-4835 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Okimoto et al.: "Optical spectra in (La, Y)TiO_3 : Variation of Mott-Hubbard gap features with cahnge of electron correlation and band filling" Physical Review B. 51. 9581-9588 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] A.Urushibara et al.: "Insulator-metal transition and giant magnetoresistance in La_<1-x>Sr_xMnO_3" Physical Review B. 51. 14103-14109 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Moritomo et al.: "Pressure effect on the double-exchange ferromagnet La_<1-x>Sr_xMnO_3 : 0.15*x*0.5" Physical Review B. 51. 16491-16494 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Tomioka et al.: "Collapse of charge-ordered state under a magnetic field in Pr_</2>Sr_<1/2>MnO_3" Physical Review Letters. 74. 5108-5111 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Yamaguchi et al.: "Magnetoresistance in metallic crystals of La_<1-x>Sr_xCoO_3" Journal of the Physical Society of Japan. 64. 1885-1888 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Okimoto et al.: "Anomalous variation of optical spectra with spin polarization in double-exchange ferromagnet : La_<1-x>Sr_xMnO_3" Physical Review Letters. 75. 109-112 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] F.Inaba et al.: "Change of electronic properties of the doping-induced insulator-metal transition in La_<-x>Sr_xVO_3" Physical Review B. 52. R2221-R2224 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Arima et al.: "Optical study of electronic structure in perovskite-type RMO_3(R=La, Y ; M=Sc, Ti, V,Cr, Mn, Fe, Co, Ni, Cu)" Journal of the Physical Society of Japan. 64. 2488-2501 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Yoshizawa et al.: "Neutron-diffraction study of the magnetic-field induced metal-insulator transition in Pr_<0.7>Ca_<0.3>MnO_3" Physical Review B. 52. R13145-R13148 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Katsufuji et al.: "Spectral weight transfer of the optical conductivity in doped Mott insulators" Physical Review Letters. 75. 3497-3500 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Kuwahara et al.: "A first-order phase transition induced by a magnetic field" Science. 270. 961-963 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Tomioka et al.: "Anomalous magnetotransport properties of Pr_<1-x>Ca_xMnO_3" Journal of the Physical Society of Japan. 64. 3626-3630 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Moritomo et al.: "Electronic structure of layred perovskite LaSrMO_4" Journal of the Physical Society of Japan. 64. 4117-4120 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Katsufuji et al.: "In-plane and out-of-plane optical spectra of Sr_2RuO_4" Physical Review Letters. 76. 126-129 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] S.Yamaguchi et al.: "Spin-state transition and high-spin polarons in LaCoO_3" Physical Review B. (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Moritomo: "Magnetic and electronic properties in hole doped manganese oxides with layered structure La_<1-x>Sr_<1+x>MnO_4" Physical Review B. 51. 3297-3300 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Katsufuji: "Optical spectroscopy of the metal-insulator transition in NdNiO_3" Physical Review B. 51. 4830-4835 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y.Okimoto: "Optical spectra in (La,Y) TiO_3 : Variation of Mott-Hubbard gap features with change of electron correlation and band filling" Physical Review B. 51. 9581-9588 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] A.Urushibara: "Insulator-metal transition and giant magnetoresistance in La_<1-x>Sr_2MrO_3" Physical Review B. 51. 14103-14109 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y.Moritomo: "Pressure effect on the double-exchange ferromagnet La_<1-x>Sr_2MeO_3 (0.15 【less than or equal】 X 【less than or equal】 0.5)" Physical Review B. 51. 16491-16494 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y.Tomioka: "Collapse of a charge-ordered state under a magnetic field in Pr_<1/2>Sr_<1/2>MrO_3" Physical Review Letters. 74. 5108-5111 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] S.Yamaguchi: "Magnetoresistance in metallic crystals of La_<1-x>Sr_xCoO_3" Journal of the Physical Society of Japan. 64. 1885-1888 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y.Okimoto: "Aromalous variation of optical spectra with spin polarization in double-exchange ferromognet : La_<1-x>Sr_xMrO_3" Physical Review Letters. 75. 109-112 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] F.Inaba: "Change of electronic properties of the doping-induced insulator-metal transition in La_<1-x>Sr_xMrO_3" Physical Review B. 52. R2221-R2224 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Arima: "Optical study of electronic structure in perovskite-type RMO_3 (R=La,Y ; M=Sc,Ti,V,Cr,Mn,Fe,Co,Ni,Cu)" Journal of the Physical Society of Japan. 64. 2488-2501 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] H.Yoshizawa: "Neutron-diffraction study of the magnetic-field-induced metal-insulator transition in Pr_<0.7>Ca_<0.3>MnO_3" Physical Review B. 52. R13145-R13148 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Katsufuji: "Spectral weight transfer of the optical corductivity in doped Maott insulators" Physical Review Letters. 75. 3497-3500 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] H.Kuwahara: "A first-order phase transition induced by a magnetic field" Science. 270. 961-963 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y.Tomioka: "Anomalous mognetotransport properties of Pr_<1-x>Ca_xMnO_3" Journal of the Physical Society of Japan. 64. 3626-3630 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y.Moritomo: "Electronic structure of layered perovskite LaSrMO_4" Journal of the Physical Society of Japan. 64. 4117-4120 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Katsufuji: "In-plane and out-of-plane optical spectra of Sr_2RuO_4" Physical Review Letters. 76. 126-129 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] S.Yamaguchi: "Spin-state transition and high-spin polarons in LaCoO_3" Physical Review B. (印刷中). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Katsufuji: "Anomalous variation of phonon Raman intensities near the metal-to-Mott-insulator..." Phys.Rev.B. 50. 2704-2707 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Y.Tokura: "Giant magnetotransport phenomena in filling-controlled Kondo lattice system" J.Phys.Soc.Jpn.63. 3931-3935 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Kumagai: "Enhanced Carrier mess near the metal-insulator transition in...." Physica B. 199&200. 628-630 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] A.Asamitsu: "A structural phase transition induced by an enternal magnetic field" Nature. 373. 407-408 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] T.Katsufuji: "EIectronic Raman scattering spectra in strongly correlated metals" Physica C. 235-240. 1147-1148 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Y.Okimoto: "Optical spectra in (La,Y) TiO_3:" Phys.Rev.B. 51(in press). (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2020-05-15  

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