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Origin of the metal-insulator transition of orbital-ordered spin-singlet system BaVS3

Research Project

Project/Area Number 11440107
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 InstitutionKYOTO UNIVERSITY

Principal Investigator

SHIGA Masayuki  Kyoto Univ., Dept. of Materials Sci. and Eng., Professor, 工学研究科, 教授 (30026025)

Co-Investigator(Kenkyū-buntansha) NAKAMURA Hiroyuki  Kyoto Univ., Dept. of Materials Sci. and Eng., Research associate, 工学研究科, 助手 (00202218)
WADA Hirofumi  Kyoto Univ., Dept. of Materials Sci. and Eng., Associate professor, 工学研究科, 助教授 (80191831)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥16,000,000 (Direct Cost: ¥16,000,000)
Fiscal Year 2001: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥13,800,000 (Direct Cost: ¥13,800,000)
KeywordsBaVS3 / metal-insulator transition / transition metal sulfide / neutron scattering / x-ray diffraction / high-field magnetization / μSR / x線回折 / 強磁場磁化過程 / フラストレーション / 三角格子 / 硫化物 / スピン液体
Research Abstract

A triangular-lattice (hexagonal) transition-metal sulfide BaVS3 shows a metal-insulator transition at 70 K. The origin of this transition would be related to spin, charge and orbital degrees of freedom, and/or low-dimensionality of the crystal structure and spin frustration, which has been attracting much attention of many researchers. Therefore the elucidation of the origin is worth investigating. The crystal structure is the hexagonal perovskite type, where vanadium atoms form one-dimensional chains along the c axis and a triangular lattice in the c plane. The formal valence of vanadium is 4+, hence in the state of spin 1/2. The purpose of this project is to grow high-quality crystals of BaVS3 and to make clear the origin of the metalinsulator transition with use of various sophisticated experimental methods. In an early stage, based on experimental results reported in literature and our NMR results, we proposed a model, which is the orbital-ordered spin-singlet state (driven by spin frustration) as appeared in the title of this project. After some experiments, however, we obtained new results which are apparently inconsistent with the model. Thus, unexpectedly, we had to check the reported experimental results step by step. As a result we found many reported data and their analyses insufficient. The conclusion obtained from new experimental results are as follows: BaVSS is a three-dimensional but anisotropic conductor, in which d orbitals form bands both along the c direction and in the c plane. These bands have considerably different characters but both contribute to the metalinsulator transition. In other words, BaVSS is a very unique anisotropic metal, where the interplay between one-dimensional-like and two-dimensional-like interactions gives rise to complicated electronic properties.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] M.Shiga: "Magnetism of geometrically frustrated metallic compounds"J. Phys. Soc. Japan. 69 Suppl. A. 147-155 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Nakamura: "Incommensurate magnetic ordering and spin-liquid-like state in a triangular lattice BaVS3: Neutron diffraction and scattering study"J. Phys. Soc. Japan. 69. 2763-2766 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Yamasaki: "Ferromagnetism of sulfur deficient BaVS3"J. Phys. Soc. Japan. 69. 3068-3071 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Yamasaki: "Magnetism of BaVSe3"J. Phys. Soc. Japan. 70. 1768-1771 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Shiga: "Metamagnetic transition in BaVS3: a Highly correlated electron system with frustration"Physica B. 294-295. 149-152 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Nakamura: "Magnetism of geometrically frustrated transition-metal sulfides : BaVS3 and related compounds"Phys. Metals Metallography. (出版予定).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M. Shiga: "Magnetism of geometrically frustrated metallic compounds"J. Phys. Soc.Japan. 69 Suppl.A. 147-155 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Nakamura: "Incommensurate magnetic ordering arid spin-liquid-like state in a triangular lattice BaVS3 : Neutron diffraction and scattering study"J. Phys. Soc. Japan. 69. 2763-2766 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Yamasaki: "Ferromagnetism of sulfur deficient BaVS3"J. Phys. Soc. Japan. 69. 3068-3071 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Yamasaki: "Magnetism of BaVSe3"J. Phys. Soc. Japan. 70. 1768-1771 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] M.Shiga: "Metamagnetic transition in BaVS3 : a highly correlated electron system with frustration"Physica B. 294-295. 149-152 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H. Nakamura: "Magnetism of geometrically frustrated transition-metal sulfides : BaVS3 and related compounds"Phys. Metals Metallography. (At press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Yamasaki: "Magnetism of BaVSe3"J. Phys. Soc. Japan. 70・6. 1768-1771 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Nakamura: "Magnetism of geometrically frustrated transition-metal sulfides : BaVS3 and related compounds"Phys. Metals Metallography. (出版予定).

    • Related Report
      2001 Annual Research Report
  • [Publications] Masayuki Shiga: "Magnetism of Frustrated Metallic Compounds BaVS_3"RIKEN Review. 27. 48-50 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masayuki Shiga: "Magnetism of Geometrically Frustrated Metallic Compounds"J.Phys.Soc.Japan Suppl.A. 69. 147-155 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Hiroyuki Nakamura: "Incommensurate Magnetic Ordering and Spin-Liquid-Like State in a Triangular Lattice BaVS_3"J.Phys.Soc.Japan. 69. 2763-2766 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Tomoaki Yamasaki: "Ferromagnetism of Sulfer Deficient BaVS_<3-δ>"J.Phys.Soc.Japan. 69. 3068-3071 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Masayuki Shiga: "Metamagnetic Transition in BaVS_3 : Highly Correlated System with Frustration"to be published in Physica B. (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Hiroyuki Nakamura: "Magnetism of Geometrically Frustrated Transition-Metal Sulfides : BaVS_3 and Related Compounds"to be published in Phys.Metals Metallography. (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 中村裕之: "Orbital Ordering in BaVS_3"Physica B. 259-261. 965-966 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 中村裕之: "Neutron Scattering Study of BaVS3: Orbital-Ordered Spin-Singlet System"J. Phys. Chem. Solid. 60. 1137-1140 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 中村裕之: "Muon Spin Relaxation in Orbital-Ordered BaVS_3"Hyperfine Interactions. 120/121. 633-647 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 中村裕之: "Exotic Quantum States Induced by Frustration"Proc. Moscow Intern. Sym on Magnetism MISM'99. 22-36 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 志賀正幸: "Magnetism of Frustrated Metallic Compounds BaVS_3"RIKEN Review (to be published). No.27. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 志賀正幸: "Magnetism of Geometrically Frustrated Metallic Compounds"Suppl. J. Phys. Soc. Japan. (to be published). (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2020-05-15  

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