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1995 Fiscal Year Final Research Report Summary

Study of the formation of Magnetic Polaron Lattice in Low-Carrier strongly Correlated Systems

Research Project

Project/Area Number 06452050
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 InstitutionTokyo Metropolitan University (1995)
Tohoku University (1994)

Principal Investigator

KOHGI Masahumi  Tokyo Metropolitan University, Department of Physics, Professor, 理学部, 教授 (30004451)

Co-Investigator(Kenkyū-buntansha) SUZUKI Takashi  Tohoku University, Department of Plapics, Professor, 大学院・理学研究科, 教授 (30004344)
IWASA Kazuaki  same as above Assistant, 理学部, 助手 (00275009)
Project Period (FY) 1994 – 1995
Keywordslow-carrier system / charge ordering / heavy electrons / Kondo effect / magnetic polaron / neutron scattering / CeP / Yb_4As_3
Research Abstract

The purpose of this project is to study the unusual properties of the low carrier systems CeP and Yb_4As_3 by means of neutron scattering. The results are as follows :
1.CeP
CeP shows unusual magnetic phase diagrams under magnetic field as well as under high pressure. It shows also typical dense-Kondo-effect like transport anomalies. Our neutron scattering studies established the magnetic phase diagrams for the magnetic field below about 6 T and for the pressure below about 2 GPa. The obtained magnetic phase diagrams are quite novel and unique. In order to explain the phase diagrams, it is necessary to take into account the fact of the low carrier density in this system. The magnetic polaron model gives the most plausible picture to understand the system.
2.Yb_4As_3
Yb_4As_3 undergoes structural phase transition at about 290K,which was claimed to be that of a charge ordering. The compound shows also heavy electron anomalies at the low temperatures in spite of its extremely low carrier density of the order of 10^<-3> per formula. Our polarized neutron study proved directly the ordering of Yb^<2+> and Yb^<3+> in this material at low temperatures. The inelastic neutron scattering studies revealed the existence of spin excitations typical of a one-dimensional antiferromagnet. They are ascribed to the one-dimensional configuration of the Yb^<3+> ions caused by the charge ordering. There is also anomalous magnetic response other than the one-dimensional spin excitations. These facts indicate that the heavy electron anomalies in this system are strongly related with the Mott-transition-type change of the electronic state caused by the charge ordering.

  • Research Products

    (32 results)

All Other

All Publications (32 results)

  • [Publications] M.Kohgi et al.: "Evidence for a Magnetic Polaron State in the Low Carrier System CeP" Phys.Rev.B. 49. 7068-7071 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kohgi et al.: "Complex Magnetic Structure of a Low Carrier System Cep under Magnetic Field" Physica B. 199&200. 606-608 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 神木正史: "強相関電子系の中性子散乱" 日本結晶学会誌. 36. 87-93 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.A.Robinson et al.: "Crystallography and Magnetism of the Heavy-Fernuon Compound YbBiPt" Phys.Rev.B. 50. 9595-9598 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Yoshizawa et al.: "Pressure Effect on Crystal Electric Field Excitations un Ultra-Low-Carrier Kondo-Lattice Systems CeP and CeAs" J.Phys.Soc.Jpn.64. 617-630 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kohgi et al.: "Formation of a Magnetic-Palaron Lattice in the Low-Carrier-Density System CeP" Phupica B. 206-207. 781-783 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Suzuki et al.: "Search for Magnetic Ordering in the Cubic Kondo Compound YbPdSb" Physica B. 206-207. 341-343 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Suzuki et al.: "Low Carrier Concentration State in f-electron Systems" Physica B. 206-207. 771-779 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kohgi et al.: "Neutron Scattering from low Carrier Density Strongly Carrelated Electron Systems" Physica B. 213-214. 110-115 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Oohara et al.: "Crystal Field Splitting in CeAs and CeP under High Pressure" Physica B. 213-214. 116-118 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Ohoyama et al.: "Aromalous Short Range Spin Correlation in Yb Monopnictides" Physica B. 213-214. 119-121 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.A.Robinson et al.: "Low-Energy Excitations and the Electronic Specific Heat of YbBiPt" Phys.Rev.Lett.75. 1194-1197 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kohgi et al.: "Magnetic Phase Diagram of CeP" J.Phys.Soc.Jpn.Suppl.B. 65. 99-104 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Osakabe et al.: "Novel Magnetic Structure of the Low-Carrier System CeP under High Pressure" Physica B. 印刷中. 印刷中 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kohgi et al.: "Charge Order and One-Dimensional Properties of Yb_4As_3" Physica B. (印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kohgi et al.: "One-Dimensionality in the Low-Carrier Heavy Electron System Yb_4As_3:A Role of Charge-Ordering"

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kohgi et al.: "Evidence for a Magnetic Polaron State in the Low Carrier System CeP" Phys.Rev.B49. 7068-7071 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kohgi et al.: "Complex Magnetic Structure of a Low Carrier System CeP under Magnetic Field" Physica B. 199 & 200. 606-608 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.A.Robinson et al.: "Crystallography and Magnetism of the Heavy-Fermion Compound YbBiPt" Phys.Rev.B. 50. 9595-9598 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Yoshizawa et al.: "Pressure Effect on Crystal Electric Field Excitation in Ultra-Low-Carrier Kondo-Lattice System CeP and CeAs" J.Phys.Soc.Jpn.64. 617-630 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kohgi et al.: "Formation of a Magnetic-Polaron Lattice in the Low-Carrier-Density system CeP" Physica B. 206-207. 781-783 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Suzuki et al.: "Search for Magnetic Ordering in the Cubic Kondo Compound YbPdSb" Physica B. 206-207. 341-343 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Suzuki et al.: "Low Carrier Concentration State in f-electron Systems" Physica B. 206-207. 771-779 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kohgi et al.: "Neutron Scattering from Low Carrier Density Strongly Correlated Electron Systems" Physica B. 213 & 214. 110-115 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Oohara et al.: "Crystal Field Splitting in CeAs and CeP under High Pressure" Physica B. 213 & 214. 116-118 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Ohoyama et al.: "Anomalous Short Range Spin Correlation in Yb monopnictides" Physica B. 213 & 214. 119-121 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.A.Robinson, et al.: "Low-energy Excitations and the Electronic Specific Heat of YbBiPt" Phys.Rev.Lett.75. 1194-1197 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kohgi et al.: "Magnetic Phase Diagram of CeP" J.Phys.Soc.Jpn.Suppl.B 65. 99-104 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Osakabe et al.: "Novel Magnetic Structure of the Low-Carrier System CeP under High Pressure" Physica B. (in press.). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kohgi et al.: "Charge Order and One-Dimensional Properties of Yb_4As_3" Physica B. (in press.). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kohgi et al.: "One-Dimensionality in the Low-Carrier Heavy Electron system Yb_4As_3 : A Role of Charge-Ordering." (to be submitted).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Kohgi: "Neutron Scattering from Strongly Correlated Electron Systems (Japanese)" J.Crystallographic Soc.Jpn.36. 87-93 (1994)

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

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Published: 1999-03-09  

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