Anisotropic Magnetic Properties and Anomalous Thermal Conductivity in the<i>b</i><i>c</i>Plane of the Quasi-Two-Dimensional Spin System Cu<sub>3</sub>B<sub>2</sub>O<sub>6</sub>: Relation between the Thermal Conductivity and the Spin State in Magnetic Fields

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  • Kudo Kazutaka
    Department of Applied Physics, Graduate School of Engineering, Tohoku University
  • Noji Takashi
    Department of Applied Physics, Graduate School of Engineering, Tohoku University
  • Koike Yoji
    Department of Applied Physics, Graduate School of Engineering, Tohoku University
  • Sakon Takuo
    Department of Mechanical Engineering, Faculty of Engineering and Resource Science, Akita University
  • Motokawa Mitsuhiro
    Institute for Materials Research, Tohoku University
  • Nishizaki Terukazu
    Institute for Materials Research, Tohoku University
  • Kobayashi Norio
    Institute for Materials Research, Tohoku University

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タイトル別名
  • Anisotropic Magnetic Properties and Anomalous Thermal Conductivity in the bc Plane of the Quasi-Two-Dimensional Spin System Cu3B2O6: Relation between the Thermal Conductivity and the Spin State in Magnetic Fields.

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説明

We have measured the magnetic susceptibility in a magnetic field of 1 T (rotating the field direction) in the bc plane, the magnetization curve in magnetic fields up to 30 T and the thermal conductivity in magnetic fields up to 14 T for the quasi-two-dimensional spin system Cu3B2O6. Two-fold symmetry of the susceptibility in the bc plane has been found to develop at low temperatures below the Néel temperature TN=10 K. This is understood on the basis of the low symmetry of the Cu–O–Cu network. The susceptibility does not appear to vanish as T→0 K even in the direction where the magnetization exhibits the minimum, indicating that the spin arrangement in the bc plane at T<TN is noncollinear. The magnetization curve exhibits a bend and/or a jump associated with either spin–flop or metamagnetic transition at T<TN, depending on the field direction. The thermal conductivity along the direction where the magnetization exhibits the minimum in the bc plane has been found to exhibit marked enhancement and a peak at T<TN, which is understood to be caused by the increase of the thermal conductivity due to magnons. The peak is suppressed with increasing magnetic-field below 12 T and tends to recover in high field above 12 T. It has been found that the thermal conductivity strongly correlates with the spin state in Cu3B2O6.

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