Muon Spin Relaxation Study of Partially Disordered State in Triangular-Lattice Antiferromagnet: Ca3Co2O6

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  • Takeshita Soshi
    Department of Physics, Faculty of Science and Technology, Tokyo University of Science
  • Arai Juichiro
    Department of Physics, Faculty of Science and Technology, Tokyo University of Science
  • Goko Tatsuo
    Department of Physics, Faculty of Science and Technology, Tokyo University of Science
  • Nishiyama Kusuo
    Muon Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
  • Nagamine Kanetada
    Muon Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)

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  • Muon Spin Relaxation Study of Partially Disordered State in Triangular-Lattice Antiferromagnet: Ca<sub>3</sub>Co<sub>2</sub>O<sub>6</sub>

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A muon spin relaxation (μSR) experiment has been performed in zero-field (ZF) and longitudinal-field (LF) conditions for a Ca3Co2O6 sample which has an antiferromagnetic triangular lattice on the ab-plane with Ising ferromagnetic chains along the c-axis. At 150 K, far above the magnetic transition temperature Tc1 (=25 K) determined from magnetization data, exponential-like relaxation curves are observed in ZF-μSR time spectra, suggesting the development of intrachain ferromagnetic coupling even far above Tc1. Below the temperature Tc2 (∼12 K) where magnetization is saturated, the tail of the relaxation curve reaches 1/3 the value of the amplitude in ZF-μSR spectra and the decoupling phenomenon in LF-μSR, that is, a further rise of the tail due to the applied LF, can be observed, implying the appearance of the static internal magnetic field. However, between Tc1 and Tc2, the above-mentioned phenomenon cannot be observed. This indicates that the internal magnetic field at each muon site is not static but rather dynamical with the fluctuation time τc (∼21 ns) although the magnetization gives large values between these temperatures. This fact must indicate the presence of a partially disordered antiferromagnetic state peculiar to the frustrated magnetic system.

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