Time-of-Flight Neutron Powder Diffraction Studies on a Chiral Two-dimensional Molecule-based Magnet

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  • Hoshikawa Akinori
    Institute of Materials Structure Science, High Energy Accelerator Research Organization
  • Kamiyama Takashi
    Institute of Materials Structure Science, High Energy Accelerator Research Organization
  • Purwanto Agus
    Institute of Materials Structure Science, High Energy Accelerator Research Organization R&D Center for Materials Science and Technology, National Nuclear Energy Agency
  • Ohishi Kazuki
    Institute of Materials Structure Science, High Energy Accelerator Research Organization
  • Higemoto Wataru
    Institute of Materials Structure Science, High Energy Accelerator Research Organization
  • Ishigaki Toru
    Department of Materials Science and Engineering, Muroran Institute of Technology
  • Imai Hiroyuki
    Department of Applied Molecular Science Institute for Molecular Science
  • Inoue Katsuya
    Department of Applied Molecular Science Institute for Molecular Science Faculty of Science, Hiroshima University

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説明

The magnetic structure of a chiral molecule-based magnet, [Cr(CN)6][Mn(S)-pnH(H2O)](H2O), has been studied using neutron powder diffraction as a function of temperature in the range from 4 K to 300 K. The 020 and 022 magnetic reflections were clearly observed below Tc=38 K. On the basis of the intensity analysis of magnetic reflections, it was concluded that the magnetic structure is noncollinear ferrimagnetic with the magnetic (Shubnikov) space group P2121′21′, and magnetic moments of Cr and Mn atoms are mutually antiparallel along a direction near the a-axis. Our findings imply that the long-period magnetic structure, if exists, is not a helical structure but a conical one.

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