Pressure-induced antiferroquadrupoleorder in CeTe
Pressure-induced antiferroquadrupoleorder in CeTe
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CeTe 中压力诱导的反铁四极有序
DOI：
10.1143/jpsj.80.023713
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
and A. Ochiai
中科院分区：
文献类型：
--
作者：
Y. Kawarasaki;T. Matsumura;M. Sera;and A. Ochiai
我们已经发现，在高压下的CeTe的磁相图变得非常相似的CeB6，强烈地表明，实现了反铁四极有序。在1.2GPa下，相变温度从0.5T时的3K上升到14.5T时的6.3K。由于CeTe晶体的晶体场基态是没有四极自由度的Γ 7二重态，这种有序化被认为是通过Γ 7和Γ 8激发态之间的非对角矩阵元实现的，其能级随压强的增加而降低.
We have discovered that the magnetic phase diagram of CeTe under high pressure becomes quite similar to that of CeB6, strongly suggesting that an antiferroquadrupolar ordering is realized. At 1.2 GPa, the transition temperature increases from 3 K at 0.5 T to 6.3 K at 14.5 T. Since the crystal-field ground state of CeTe is the Γ7doublet without a quadrupolar degree of freedom, this ordering is considered to be realized through the off-diagonal matrix element between Γ7and Γ8excited state, whose energy level is lowered with increasing the pressure.