Gapped Ground State in the Spin-1/2 Trimer Chain System Cu3Cl6(H2O)2・2H8C4SO2

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  • Ishii Mariko
    Department of Physics, Tokyo Institute of Technology, Meguro–ku, Tokyo 152–8551
  • Tanaka Hidekazu
    Department of Physics, Tokyo Institute of Technology, Meguro–ku, Tokyo 152–8551
  • Hori Mikiko
    Department of Physics, Tokyo Institute of Technology, Meguro–ku, Tokyo 152–8551
  • Uekusa Hidehiro
    Department of Chemistry, Tokyo Institute of Technology, Meguro–ku, Tokyo 152–8551
  • Ohashi Yuji
    Department of Chemistry, Tokyo Institute of Technology, Meguro–ku, Tokyo 152–8551
  • Tatani Keiji
    Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560–0043
  • Narumi Yasuo
    Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560–0043 CREST, Japan Science and Technology, Kawaguchi, Saitama 332–0012
  • Kindo Koichi
    Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560–0043 CREST, Japan Science and Technology, Kawaguchi, Saitama 332–0012

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  • Gapped Ground State in the Spin 1 2 Trimer Chain System Cu3Cl6 H2O 2 2H8C4SO2

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The magnetic susceptibility and magnetization curves of an S=½ trimer spin chain system Cu3Cl6(H2O)2·2H8C4SO2 have been measured using single crystals and polycrystals. It was found that the ground state at zero-field is a spin singlet with an excitation gap. This result suggests that the translational symmetry of the Hamiltonian is spontaneously broken in the ground state. A model for the ground state is proposed. The magnetization curve measured at 0.08 K for polycrystals shows that the gap closes at Hc ≈ 3.9 T, from which the magnitude of the gap is evaluated as Δ /kB≈5.2 K.

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