Magnetic Phase Diagrams of Y-Diluted Antiferromagnet Tb_<1-x>Y_xB_2C_2(0.2≤x≤0.5)(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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Magnetic B-T phase diagrams were examined by magnetization and specific heat experiments on the single crystalline Tb_<1-x>Y_xB_2C_2 (0.2≤x<0.5) compounds, and neutron diffraction experiments was performed on the powder Tb_<0.5>Y_<0.5> ^<11>B_2C_2 sample. The magnetization curves evidence that the fieldinduced transition occurs from phase IV into phase II' through a mixed phase of both phases, where phase IV is antiferrornagnetic 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.
社団法人日本物理学会の論文
2006-07-15