Dielectric Polarization Measurements on the Antiferromagnetic Triangular Lattice System CuFeO_2 in Pulsed High Magnetic Fields(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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Dielectric polarization parallel to the [110] direction of a single crystal of the triangular lattice antiferromagnet CuFeO_2 has been measured by a pyroelectric method in pulsed high magnetic fields up to 43T applied along the [001] direction. No distinct spontaneous dielectric polarization P is detected in the fourth field-induced phase with a noncollinear spin structure and 4-, 5-, and 3-sublattice phases with commensurate collinear spin structures. Among five magnetic phases that appear in magnetic fields, a finite P is observed only in the first field-induced phase with the incommensurate noncollinear spin structure. We also confirmed that P in the first field-induced phase is predominantly oriented within the (001) plane. A strong history dependence has been observed in P, and is interpreted in terms of the alignment and repopulation of magnetic Q-domains. The experimental technique for measuring P in pulsed high magnetic fields is described in detail.
社団法人日本物理学会の論文
2007-09-15