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1999 Fiscal Year Final Research Report Summary

Spin-charge ordering and charge dynamics in electron-doped high-Tc superconductors

Research Project

Project/Area Number 10440100
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 InstitutionUniversity of Tokyo

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) TAGUCHI Yasujiro  University of Tokyo, Department of Applied Physics, Research associate, 大学院・工学系研究科, 助手 (70301132)
Project Period (FY) 1998 – 1999
Keywordselectron-doped high-Tc superconductor / reflectivity spectrum / spin-charge ordering / pseudo-gap structure / charge ordering / electronic phase separation / reducing procedure / suppression of superconductivity
Research Abstract

We have grown single crystals of Nd_<2-x>Ce_xCuO_<4+y> (x=0, 0.05, 0.1, 0.125, 0.15) by traveling solvent floating zone method and have investigated the temperature dependence of charge and lattice dynamics by the measurements of optical reflectivity spectra. In the as-grown crystals with x=0.05, 0.10, 0.125, we have observed pseudo-gap structure and anomalies in phonon modes at low temperatures which are similar to those observed in non-superconducting sample with x=0.15. This indicates the presence of instability to-ward charge-ordering or electronic phase separation for a broad range of doping levels in this system. The difference from the sample with x=0.15 consists of two points, namely, the increased energy of the pseudo-gap structure and the increased onset temperature of the pseudo-gap with reduced doping-levels.
We have also investigated the reduced crystal with x=0.125 that is in the vicinity of superconducting-nonsuperconducting trasition point. The resistivity shows metallic be-havior, but at low temperature it shows a modest uptern and does not exhibit the super-conductivity. The pseudo-gap structure has been observed to open up at a slightly higher temperature than the resistivity uptern also in this sample. This strongly suggests that the instability that is responsible for the pseudo-gap suppresses the superconductivity in this electron-doped system.

  • Research Products

    (63 results)

All Other

All Publications (63 results)

  • [Publications] T.Ishikawa: "Optical response to orbital and charge ordering in a layered manganite:La_<1/2>Sr_<3/2>MnO_4"Phys.Rev.B. 59. 8367-8370 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Manako: "Epitaxial thin films of ordered double perovskite Sr_2FeMoO_6"Appl.Phys.Lett.. 74. 2215-2217 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Furukawa: "Electronic correlations on the verge of the Mott transition in La_<1-x>Sr[_xTiO_3 by ^<47/49>Ti and ^<139>La nuclear magnetic resonance"Phys.Rev.B. 59. 10550-10558 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Fiebig: "Reflection spectroscopy on the photoinduced local metallic phase of Pr_<0.7>Ca_<0.3>MnO_3"Appl.Phys.Lett.. 74. 2310-2312 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Tokunaga: "High-field magnetization and magnetoresistance of La_<0.5>Sr_<1.5>MnO_4"Phys.Rev.B. 59. 11151-11154 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.-I.Kobayashi: "Intergrain tunneling magnetoresistance in polycrystals of the ordered double perovskite Sr_2FeReO_6"Phys.Rev.B. 59. 11159-11162 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Horiuchi: "Effect of chemical doping on the ferroelectric neutral-ionic phase transition in tetrathiafulvalene-p-chloranil(TTF-QCl_4)"Phys.Rev.B. 59. 11267-11275 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kuwahara: "Two-dimensional charge-transport and spin-valve effect in layered antiferromagnet Nd_<0.45>Sr_<0.55>MnO_3"Phys.Rev.Lett.. 82. 4316-4319 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.Kumai: "Current-induced insulator-metal transition and pattern formation in an organic charge-transfer complex"Science. 284. 1645-1647 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A.Sekiyama: "Electronic states of charge-ordering Nd_<0.5>Sr_<0.5>MnO_3 probed by photoemission"Phys.Rev.B. 59. 15528-15532 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Fukumura: "Spontaneous bubble domain formation in a layered ferromagnetic crystal"Science. 284. 1969-1971 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Onose: "Anomalous pseudogap formation in a nonsuperconducting crystal of Nd_<1.85>Ce_<0.15>CuO_<4+y>: Implication of charge ordering"Phys.Rev.Lett.. 82. 5120-5123 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Izumi: "Structure characterization and magnetic properties of oxide superlattices La_<0.6>Sr_<0.4>MnO_3/La_<0.6>Sr_<0.4>FeO_3"Phys.Rev.B. 60. 1211-1215 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Okuda: "Low-temperature transport properties in a bilayered manganite La_<1.3>Sr_<1.7>Mn_2O_7"Phys.Rev.B. 60. 3370-3374 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Yamamoto: "Probing charge/orbital correlation in La_<1.2>Sr_<1.8>Mn_2O_7 by Raman spectroscopy"J.Phys.Soc.Jpn.. 68. 2538-2541 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Katsufuji: "Commensurability effect on the charge ordering of La_<2-x>Sr_xNiO_4"Phys.Rev.B. 60. R5097-R5100 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Higuchi: "Crystal-field splitting and the on-site Coulomb energy of La_xSr_<1-x>TiO_3 from resonant soft-x-ray emission spectroscopy"Phys.Rev.B. 60. 7711-7714 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Fiebig: "Action spectra of the two-stage photo-induced insulator-metal transition in Pr_<1-x>Cr_xMnO_3"Phys.Rev.B. 60. 7944-7949 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.Kajimoto: "Hole concentration induced transformation of the magnetic and orbital structure in Nd_<1-x>Sr_xMnO_3"Phys.Rev.B. 60. 9506-9517 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Taguchi: "Magnetotransport phenomena in a metallic ferromagnet on the verge of Mott transition: Sm_2Mo_2O_7"Phys.Rev.B. 60. 10280-10283 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E.Saitoh: "Coherent-incoherent crossover of charge dynamics in the ferromagnetic ground state of manganites: R_<0.6>Sr_<0.4>MnO_3(R=La-Sm)"Phys.Rev.B. 60. 10362-10366 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.K.Park: "Variation of charge-ordering transitions in R_<1/3>Sr_<2/3>FeO_3(R=La,Pr,Nd,Sm,and Gd)"Phys.Rev.B. 60. 10788-10795 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kimura: "Diffuse phase transition and phase separation in Cr-doped Nd_<1/2>Ca_<1/2>MnO_3: A relaxor ferromagnet"Phys.Rev.Lett.. 83. 3940-3943 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Shimomura: "X-ray diffuse scattering due to polarons in a colossal magnetoresistive manganaite"Phys.Rev.Lett.. 83. 4389-4392 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Katsufuji: "Transport and magnetic properties of a ferromagnetic metal: Eu_<1-x>La_xTiO_3"Phys.Rev.B. 60. R15021-R15023 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.v.Zimmermann: "Interplay between charge,orbital,and magnetic order in Pr_<1-x>Ca_xMnO_3"Phys.Rev.Lett.. 83. 4872-4875 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Yamanouchi: "Dielectric breakdown of the insulating charge-ordered state in La_<2-x>Sr_xNiO_4"Phys.Rev.Lett.. 83. 5555-5558 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Tomioka: ". Magnetic and electronic properties of a single crystal of ordered double perovskite Sr_2FeMoO_6"Phys.Reb.B. 61. 422-427 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Yoshizawa: "Stripe order at low temperatures in La_<2-x>Sr_xNiO_4 with 0.289 【less than or equal】 x 【less than or equal】 0.5"Phys.Rev.B. 61. R854-R857 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] V.V.Krishnamurthy: "Critical spin dynamics in Nd_<1-x>Sr_xMnO_3"Phys.Rev.B. 61. 4060-4069 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.M.Savosta: "Magnetic and transport properties of Pr_<0.65>Ca_<0.21>Sr_<0.14>MnO_3 and Pr_<0.65>Ba_<0.35>MnO_3 single crystals"Phys.Rev.B. 61. 6896-6901 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Tokura: "Colossal magnetoresistive oxides"Gordon and Breach. (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Ishikawa et al.: "Optical response to orbital and charge ordering in a layered manganite : La_<1/2>Sr_<3/2>MnO_4"Phys.Rev.B. 59. 8367-8370 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Manako et al.: "Epitaxial thin films of ordered double perovskite Sr_2FeMoO_6"Appl.Phys.Lett.. 74. 2215-2217 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Furukawa et al.: "Electronic correlations on the verge of the Mott transition in La_<1-x>Sr_xTiO_3 by 47/49Ti and 139La nuclear magnetic resonance"Phys.Rev.B.. 59. 10550-10558 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Fiebig et al.: "Reflection spectroscopy on the photoinduced local metallic phase of Pr_<0.7>Ca_<0.3>MnO_3"Appl.Phys.Lett.. 74. 2310-2312 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Tokunaga et al.: "High-field magnetization and magnetoresistance of La_<0.5>Sr_<1.5>Mno_4"Phys.Rev.B. 59. 11151-11154 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.-I,Kobayashi et al.: "Intergrain tunneling magentoresistance in polycrystals of the ordered double perovskite Sr_2FeReO_6"Phys.Rev.B. 59. 11159-11162 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Horiuchi et al.: "Effect of chemical doping on the ferroelectric neutral-ionic phase transition in tetrathiafulvalene-p-chloranil(TTF=QC14)"Phys.Rev.B. 59. 11267-11275 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kuwahara et al.: "Two-dimensional charge-transport and spin-valve effect in layered antiferromagnet Nd_<0.45>Sr_<0.55>MnO_3"Phys.Rev.Lett.. 82. 4316-4319 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Kumai et al.: "Current-induced insulator-metal transition and pattern formation in an organic charge-transfer complex"Science. 284. 1645-1647 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Sekiyama et al.: "Electronic states of charge-ordering Nd_<0.5>Sr_<0.5>MnO_3 probed by photoemission"Phys.Rev.B. 59. 15528-15532 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Fukumura et al.: "Spontaneous bubble domain formation in a layered ferromagnetic crystal"Science. 284. 1969-1971 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Onose et al.: "Anomalous pseudogap formation in a nonsuperconducting crystal of Nd_<1.85>Ce_<0.15>CuO_<4+y> Implication of charge ordering"Phys.Rev.Lett.. 82. 5120-5123 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Izumi et al.: "Structure characterization and magnetic properties of oxide superlattices La_<0.6>Sr_<0.4>MnO_3/La_<0.6>Sr_<0.4>Feo_3"Phys.Rev.B. 1211-1215 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Okuda et al.: "Low-temperature transport properties in a bilayered manganite La_<1.3>Sr_<1.7>Mn_2O_7"Phys.Rev.B. 60. 3370-3374 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Yamamoto et al.: "Probing charge/orbital correlation in La_<1.2>Sr_<1.8>Mn_2O_7 by Raman spectroscopy"J.Phys.Soc.Jpn.. 68. 2538-2541 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Katsufuji et al.: "Commensurability effect on the charge ordering of La_<2-x>Sr_xNiO_4"Phys.Rev.B. 60. R5097-R5100 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Higuchi et al.: "Crystal-field splitting and the on-site Coulomb energy of La_xSr_<1-x>TiO_3 from resonant soft-x-ray emission spectroscopy"Phys.Rev.B. 60. 7711-7714 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Fiebig et al.: "Action spectra of the two-stage photo-induced insulator-metal transition in Pr_<1-x>Ca_xMnO_3"Phys.Rev.B. 60. 7944-7949 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Kajimoto et al.: "Hole concentration induced transformation of the magnetic and orbital structure in Nd_<1-x>Sr_xMnO_3"Phys.Rev.B. 60. 9506-9517 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Taguchi et al.: "Magnetotransport phenomena in a metallic ferromagnet on the verge of Mott transition : Sm_2Mo_2O_7"Phys.Rev.B. 60. 10280-10283 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] E.Saitoh et al.: "Coherent-incoherent crossover of charge dynamics in the ferromagnetic ground state of manganites : R_<0.6>Sr_<0.4>MnO_3(R=La-Sm)"Phys.Rev.B. 60. 10362-10366 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.K.Park et al.: "Variation of charge-ordering transitions in R_<1/3>Sr_<2/3>FeO_3(R=La, Pr, Nd, Sm, and Gd)"Phys.Rev.B. 60. 10788-10795 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kimura et al.: "Diffuse phase transition and phase separation in Cr-doped Nd_<1/2>Ca_<1/2>MnO_3 : A relaxor ferromagnet"Pnys.Rev.Lett.. 93. 3940-3943 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.shimomura et al.: "X-ray diffuse scattering due to polarons in a colossal magnetoresistive manganaite"Phys.Rev.Lett.. 93. 4389-4392 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Katsufuji et al.: "Transport and magnetic properties of a ferromagnetic metal : Eu_<1-x>La_xTiO_3"Phys.Rev.B. 60. R15021-R15023 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.v.Zimmermann et al.: "Interplay between charge, orbital, and magnetic order in Pr_<1-x>Ca_xMnO_3"Phys.Rev.Lett.. 83. 4872-4875 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Yamanouchi et al.: "Dielectric breakdown of the insulating charge-ordered state in La_<2-X>Sr_xNiO_4"Phys.Rev.Lett.. 83. 5555-5558 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Tomioka: "Magnetic and electronic propeties of a single crystal ofordered doubel perovskite Sr_2FeMoO_6"Phys.Reb.B. 61. 422-427 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Yoshizawa et al.: "Stripe order at low temperatures in La_<2-x>Sr_xNiO_4 with 0.289 < x <0.5"Phys.Rev.B. 61. R854-R857 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] V.V.Krishnamurthy et al.: "Critical spin dynamics in Nd_<1-x>Sr_xMnO_3"Phys.Rev.B. 61. 4060-4069 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.M.Savosta: "Magnetic and transport properties of Pr_<0.65>Ca_<0.21>Sr_<0.14>MnO_3 and Pr_<0.65>Ba_<0.35>MnO_3 single crystals"Phys.Rev.B. 61. 6896-6901 (2000)

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

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Published: 2002-03-26  

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