Magnetic Phase Diagrams of Y-Diluted Antiferromagnet Tb1-xYxB2C2(0.2≦x≦0.5)

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  • Haino Masami
    Department of Physics, Graduate School of Science, Tohoku University
  • Tobo Aya
    Department of Physics, Graduate School of Science, Tohoku University
  • Matsuoka Eiichi
    Department of Physics, Graduate School of Science, Tohoku University
  • Ohoyama Kenji
    Institute for Materials Research, Tohoku University
  • Onodera Hideya
    Department of Physics, Graduate School of Science, Tohoku University

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タイトル別名
  • Magnetic Phase Diagrams of Y-Diluted Antiferromagnet Tb1−xYxB2C2 (0.2≤x≤0.5)
  • Magnetic Phase Diagrams of Y Diluted Antiferromagnet Tb1 xYxB2C2 0 2 x 0 5
  • Magnetic Phase Diagrams of Y-Diluted Antiferromagnet Tb<sub>1-<i>x</i></sub>Y<sub><i>x</i></sub>B<sub>2</sub>C<sub>2</sub> (0.2 ≤<i>x</i> ≤0.5)

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説明

Magnetic B–T phase diagrams were examined by magnetization and specific heat experiments on the single crystalline Tb1−xYxB2C2 (0.2≤x≤0.5) compounds, and neutron diffraction experiments was performed on the powder Tb0.5Y0.511B2C2 sample. The magnetization curves evidence that the field-induced transition occurs from phase IV into phase II′ through a mixed phase of both phases, where phase IV is antiferromagnetic and phase II′ is a field-induced phase with the antiferromagnetic and antiferroquadrupolar order. The mixed phase (IV+II′) is enhanced by the Y-dilution, and the lower and upper verges of the mixed phase become clearer in the differential magnetization dM⁄dB–B curves. The Y-dilution results in scaling down of the ordered phases regions in the B–T space. The ways of scale down of the ordered phase are different between two field directions along the tetragonal [100] and [110]-axes, that is, the anisotropy of phase stability is increased by the Y dilution. It is supposed that the enhancement of anisotropic phase stability by the Y dilution may be due to the symmetry of the multipoles and the anisotropic multipolar interactions weakened by the Y dilution.

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