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2000 Fiscal Year Final Research Report Summary

Single Crystal Growth of Sulphospinel CuIr_2S_4 which exhibits the metal-insulator transition

Research Project

Project/Area Number 11640329
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionMuroran Institute of Technology

Principal Investigator

NAGATA Soichi  Muroran Institute of Technology, Dept.of Materials Science and Engineering, Professor, 工学部, 教授 (80155936)

Co-Investigator(Kenkyū-buntansha) EBISU Shuji  Muroran Institute of Technology, Dept.of Materials Science and Engineering, Research Associate, 工学部, 助手 (10250523)
Project Period (FY) 1999 – 2000
KeywordsCuIr_2S_4 / Single crystal growth / Metal-insulator transition / Sulphospinel / 5d-electron / Crystal transformation / Magnetic susceptibility / Electrical resistivity
Research Abstract

The normal sulphospinel CuIr_2S_4 exhibits a temperature-induced metal-insulator (M-I) transition around 226 K with structural transformation, showing hysteresis on heating and cooling With decreasing temperature, a symmetry change occurs from cubic to tetragonal symmetry and a change from the Pauli paramagnetism in metallic behavior to diamagnetism due to the atomic core orbital. A gap in the electronic density of states opens below the M-I transition temperature. It has been verified that d-electrons of Ir atom on the octahedral B-sites have a significant role for the M-I transition.
Single crystals of a sulphospinel CuIr_2S_4 have been successfully grown from bismuth solution by a slow cooling method for the first time. The grown crystals have a maximum edge of about 1 mm in size and a mirror-like shining surface. Optimum growth conditions are fairly strict. The specific weight of starting materials for the crystal growth is found to be 0.30 g of CuIr_2S_4 and 10.0 g of Bi in order to obtain good quality crystals. The starting and finishing temperatures for the slow cooling step in the temperature control are 1000 and 500 ℃. The pertinent cooling rate is 〜2 ℃/h. Since the volume of bismuth itself expands in the transition from liquid phase to solid phase, a simple method of separation of the grown crystals from the liquid solution is proposed for avoiding the mechanical damages to the grown crystals. The single crystals have the normal-spinel structure of the lattice constant a =9.849 Å at room temperature. A step-like anomaly in the susceptibility of the single crystals, corresponding to the metal-insulator transition in the resistivity, occurs much sharply than in the powder specimen.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] N.Matsumoto: "Metal-Insulator Transition and Superconductivity in the Spinel-Type Cu (Ir_<1-x>Rh_x)_2S_4 System"Phys.Rev.. B60. 5258-5265 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.Endoh: "Antiferromagnetic Transition in CuRh_2O_4"J.Phys.Chem.Solids. 60. 457-462 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Matsumoto: "Resistance and Susceptibility Anomalies in IrTe_2 and CuIr_2Te_4"J.Low Temp.Phys.. 117. 1129-1133 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.L.W.Hart: "Electronic Structure of Cu_<1-x>Ni_xRh_2S_4 and CuRh_2Se_4 : Band-structure Calculations, X-ray Photoemission, and Fluorescence Measurements"Phys.Rev.. B61. 4230-4237 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Matsumoto: "Single Crystal Growth of Sulphospinel CuIr_2S_4 from Bi Solution"J.Crystal Growth. 210. 772-776 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 永田正一: "硫化物の超伝導"金属(アグネ技術センター発行). 70. 542-549 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Matsumoto and S.Nagata: "Single Crystal Growth of Sulphospinel CuIr_2S_4 from Bi Solution"J.Crys.Growth. 210. 772-776 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Nagata: "Servey of the Superconductivity in Sulfides. (in Japanese)"Metal (AGNE Publ.) No.7. 70. 542-549 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G.L.W.Hart, W.E.Pickett, E.Z.Kurmaev, D.Hartmann, M.Neumann, A.Moewes, D.L.Ederer, R.Endoh, K.Taniguchi, and S.Nagata: "Electronic Structure of Cu_<1-x>Ni_xRh_2S_4 and CuRh_2Se_4 : Band-structure Calculations, X-ray Photoemission, and Fluorescence Measurements"Phys.Rev.No.6. B61. 4230-4237 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Matsumoto, R.Endoh, S.Nagata, T.Furubayashi, and T.Matsumoto: "Metal-Insulator Transition and Superconductivity in the Spinel-Type Cu (Ir_<1-x>Rh_x)_2S_4 System"Phys.Rev.No.8. B60. 5258-5265 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Endoh, O.Fujishima, T.Atake, N.Matsumoto, M.Hayashi, and S.Nagata: "Antiferromagnetic Transition in CuRh_2O_4"J.Phys.Chem.Solids. 60. 457-462 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Matsumoto, K.Taniguchi, R.Endoh, H.Takano, and S.Nagata: "Resistance and Susceptibility Anomalies in IrTe_2 and CuIr_2Te_4"J.Low Temp.Phys.. 117 5/6. 1129-1133 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Nagata and T.Atake: "Survey of Chalcogenide Superconductors"J.of Thermal Analysis and Calorimetry. 57. 807-821 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Balcerek, Cz.Marucha, R.Wawryk, T.Tyc, N.Matsumoto, and S.Nagata: "Thermal Conductivity and Thermoelectric Power of CuIr_2S_4 and CuIr_2Se_4 Spinels"Philos.Mag.No.7. B79. 1021-1028 (1999)

    • 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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