Anisotropic magnetic properties and anomalous thermal conductivity in the bc plane of the quasi-two-dimensional spin system Cu3B 2O6: Relation between the thermal conductivity and the spin state in magnetic fields

Kazutaka Kudo, Takashi Noji, Yoji Koike, Takuo Sakon, Mitsuhiro Motokawa, Terukazu Nishizaki, Norio Kobayashi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

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 Cu3B 2O6. 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 < T N 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 Cu 3B2O6.

Original languageEnglish
Pages (from-to)569-575
Number of pages7
Journaljournal of the physical society of japan
Volume72
Issue number3
DOIs
Publication statusPublished - Mar 1 2003
Externally publishedYes

Keywords

  • Antiferromagnetic ordering
  • Cubo
  • Magnetization
  • Single crystal
  • Spin flop
  • Thermal conductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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