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Magnetic properties of Oxygen Monolayrs on Graphite and Hexagonal Boron Nitride

Research Project

Project/Area Number 03452049
Research Category

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

Allocation TypeSingle-year Grants
Research Field 物性一般(含極低温・固体物性に対する理論)
Research Institutionuniversity of Tokyo

Principal Investigator

SUEMATSU Hiroyoshi  University of Tokyo, dept.of physics, Professor, 理学部, 教授 (70013513)

Co-Investigator(Kenkyū-buntansha) IKEDA Hironobu  Photon Factory, National laboratory for High Energy Physics, Professor, 教授 (90013523)
MURAKAMI Youichi  Univ.of Tokyo, dept.of physics, Research assosiate, 理学部, 助手 (60190899)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1992: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1991: ¥4,900,000 (Direct Cost: ¥4,900,000)
KeywordsOxygen Monolayrs / 1D-Autiferromagnetic Transition / Low-Dimensional magnet / 2D-Autiferromagnetic Transition / 酸素の磁性 / モノレイヤ- / 酸素分子膜 / 磁気相転移 / 三角格子反強磁性体
Research Abstract

An oxygen monolayr physisorbed on a layred crystal surface is a most ideal system of the two-dimensional (2D) magnetism. In the case of graphite substrate, the high density monolayr, xi-phase, which has a triangular lattice with the molecular axis perpendicular to the surface, gives rise to an antiferromagnetic transition at 11.9 K and changes to the low-temperature epsilon-phase with a distorted triangular lattice. These features have been observed so far by the magnetic susceptibility and X-ray diffraction measurements. However, the spin structure of the low temperature phase has not determined directly. By use of the neutron diffraction measurement, we have succeeded for the first time to observe the antiferromagnetic structure of the co-linear spin configuration. The most important result is a remarkable magnetic moment reduction of an oxygen molecule ; that is, S = 0.61, being only 61% of the full moment (S=1). This reduction is not understood yet, but related plausibly to the spin fluctuation inherent in the low dimensional triangular magnet.
Another important result is the investigation of oxygen monolayrs on hexagonal boron nitride (h-BN), a substance having a very similar crystal structure but a little smaller substrate potential than graphite. We have observed a new antiferromagnetic transition in the low density delta-phase. According to the SR X-ray diffraction this new phase has a 2D rectangular lattice with large anisotropic lattice constants, and it shows an anomalous kinetics of the antiferromagnetic transition, namely, the logarithmic time development of domain growth ; these facts indicate a pseudo-1D spin system. Furthermore we have observed a drastic decrease of susceptibility below the critical temperature, as chi = exp (-To/T), which represents the existence of a energy gap of spin excitation. Considering a 1D spin system with S = 1, this new phase may suggest to be the Haldene phase.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] 村上洋一 他: ""Neutron diffraction study of oxygen monolayers"" Physica B213&214. 233-235 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 村上洋一・寿栄松宏仁: ""Magnetic and melting transitions of oxygen monolayers and multilayers physisorped on exfoliated graphite."" Physical Review. 54. 4146-4154 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 村上洋一: ""Magnetic and structural phase transitions of physisorbed oxygen layers"" J. Pays. Chem. Solids. 59. 467-485 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 柴田智宏 他: ""Crystal structures and magnetism of oxygen monolayers on hexagonal boron nitride"" Surface Science. (in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 柴田智宏・寿栄松宏仁: ""The effect of argon on the oxygen monolayers : Non-magnetic impurity in a one-dimensional magnet"" Phys. Rev.(submitted). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Youichi Murakami, et.al.: "Neutron diffraction study of oxygen monolayrs" Physica. B213&214. 233-235 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Youichi Murakami and Hiroyoshi Suematsu: "Magnetic and melting transitions of oxygen monolayrs and multilayrs physisorped on exfoliated graphite" Phys.Rev.54. 4146-4154 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Youichi Murakami: "Magnetic and structural phase transitions of hysisorbed oxygenlayrs" J.Phys.Chem.Solids. 59. 467-485 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Tomohiro Shibata, et.al.: "Crystal structures and magnetism of oxygen monolayrs on hexagonal boron nitride" Surface Science. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Tomohiro Shibata and Hiroyoshi Suematsu: "The effect of argon on the oxygen monolayrs : Non-magnetic impurity in a one-dimensional magnet" Phys.Rev.(submitted). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Yoshida: "Growth of Face-centered-cubic Single Crystals of C_<60> from Boiling Benzene" Applied Physics Letters. 161. 1043-1044 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Arai: "Irreversible Structural Transitions of Orthrhombic C_<60>ingli Crystal to Face-centered-cubic Phase." Journal of Physical Society of Japan. 161. 1821-1822 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Arai: "Resistivity of Single Crystal C_<60> and Effect of Oxygen" Solid State Communications. 184. 827-829 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] H.Suemats: "Electronic and Magnetic Properties of Alkali Doped C60 Crystals" Journal of Materials Scienceand Engineering B. (1933)

    • Related Report
      1992 Annual Research Report
  • [Publications] H.Suematsu: "Structural Phase Transitions and Kinetic Processes in Graphite Intercalation Compounds" Kluwer Academic Publishers, The Netherlands, (1933)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Arai: "Irreversible Structural Transition of Orthorhombic C60 Crystal to FaceーCentered Cubic Phase" J.Phy.Soc.Japan.1992. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] N.Metoki: "Scaling Features in OneーDimensional FirstーOrder Phase Transition in Stage 1 RbーGraphite Intercalation Compound" Synthtic Metals,. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Y.Itoh: "Stability of ー2Dimensional Intercalant Structure in KxTiS2" Synthetic Metals,. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] H.Suematsu: "Structural Phase Transitions and Kinetic Processes in Graphite Intercalation Compounds" Kluwer Academic Publishers,The Netherlands., 20 (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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