Observation of a different magnetic disorder in ErCo2
Observation of a different magnetic disorder in ErCo2
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DOI：
10.1103/physrevb.76.094409
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发表时间：
2007-09-01
影响因子：
3.7
通讯作者：
Cuello, Gabriel J.
中科院分区：
文献类型：
--
作者：
Herrero-Albillos, Julia;Bartolome, Fernando;Cuello, Gabriel J.
介绍了Laves相化合物ErCo2的x射线磁圆二色性（XMCD）、小角中子散射（SANS）和交流磁化率（chi(ac)）随温度和磁场的变化规律。这些结果使人们可以详细地研究ErCo2的顺磁相。XMCD数据揭示了相图上的一个扩展区域，在该区域，在远高于铁磁有序温度的温度下，Er和Co亚晶格的净磁化方向相反。通过SANS和chi（ac）测量对这一现象的完整描述，使我们能够提出短距离磁序的存在，我们对其进行了描述和系统研究，并将其称为准像性。根据系统中存在的不同磁相互作用，分析了准像性的起源。我们得出结论，ErCo2中的顺磁是由Co磁团簇的形成驱动的，这些团簇在顺磁相内是铁磁耦合的。
X-ray magnetic circular dichroism (XMCD), small-angle neutron scattering (SANS), and ac magnetic susceptibility (chi(ac)) measurements as a function of temperature and magnetic field on the Laves phase compound ErCo2 are presented. The results allow one to investigate in detail the ErCo2 paramagnetic phase. The XMCD data reveal an extended region on the phase diagram where the net magnetization of the Er and Co sublattices are oriented in opposite directions at temperatures well above the ferrimagnetic ordering temperature. The complete characterization of the phenomenon by means of SANS and chi(ac) measurements allows us to propose the occurrence of short-range magnetic order, which we described and systematically studied and which we denote as parimagnetism. The origin of the parimagnetism is analyzed in terms of the different magnetic interactions present in the system. We conclude that parimagnetism in ErCo2 is driven by the formation of Co magnetic clusters which are ferromagnetically coupled within the paramagnetic phase.