Magnetic-octupole order in neptunium dioxide?

Magnetic-octupole order in neptunium dioxide?
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二氧化镎的磁性八极秩序?

DOI:
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发表时间:
2000
影响因子:
8.6
通讯作者:
G. Amoretti
G. Amoretti
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
P. Santini;G. Amoretti

文献摘要

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大约 50 年前发现的 NpO2 中 25 K 时发生的相变是锕系化合物物理学中最持久的谜团。基于磁或电四极秩序的理论不可避免地导致与观察结果的基本定性不一致。我们证明,如果将有序参数假设为 gamma(2) ( xyz) 对称性的磁八极子,则可以理解 NpO2 的现象学。 NpO2 是第一个被发现有八极相变迹象的化合物。
The phase transition occurring at 25 K in NpO2, discovered almost 50 years ago, is the most long-lasting mystery in the physics of actinide compounds. Theories based on magnetic or electric-quadrupole order lead inevitably to fundamental, qualitative inconsistencies with observations. We show that the phenomenology of NpO2 can be understood if the order parameter is assumed to be a magnetic octupole of gamma(2) ( xyz) symmetry. NpO2 is the first compound for which indications of an octupolar phase transition have been found.