Appearance of the Phase IV in Ce_xLa_<1-x>B_6 at x ∼ 0.8

概要

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We have studied the transport, magnetic and elastic properties of Ce_<0.8>La_<0.2>B_6 single crystal. The phase IV which existed for x ≤ 0.75 in Ce_xLa_<1-x>B_6 was found to exist in this sample but its existenceregion is very small. The magnetic phase diagram indicates that the phase IV appears in order to avoid a direct contact between the antiferromagnetic phase III dominated by the O_<xy> -type antiferro-quadrupolar ordering and the paramagnetic phase I. The anisotropy of the magnetization was discovered in the phase IV above H ∼ 0.3 T. There, the magnetization is large for H ‖ <001> but small for H ‖ <110>. From the results of the anisotropic behaviors of the magnetization in the phase IV, we proposed that there exist the three domain states, K_<xy>, K_<yz>. and K_<zx> at H = 0 and in the K_<xy> domain, M under H ‖ z is large and that under H ‖ x or y is small. Based on the anisotropy of M and the smooth x dependence of T_N and T^<IV-I>_N through x ∼ 0.8, we discussed the possibility of the magnetic ordering in the phase IV. T_βtype antiferro-octupolar ordering whose possibility was discussed in detail by Kuramoto and Kusunose [J. Phys. Soc. Jpn. 69 (2000) 671] is also discussed.
社団法人日本物理学会の論文
2003-11-15