Observation of a griffiths-like phase in the magnetocaloric compound Tb5Si2Ge2
Observation of a griffiths-like phase in the magnetocaloric compound Tb5Si2Ge2
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DOI：
10.1103/physrevlett.96.167201
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发表时间：
2006-04-28
影响因子：
8.6
通讯作者：
Sousa, JB
中科院分区：
文献类型：
--
作者：
Magen, C;Algarabel, PA;Sousa, JB
通过磁化率和小角中子散射实验，在Tb5Si2Ge2(T-C=110K)中观察到了类格里菲斯相的开始。结果表明，当T-C<；T<；T-G接近200K时，磁化率指数倒数小于1的铁磁性团簇系统的生长。我们认为，类Griffiths态是由晶体结构中的局域无序引起的，并通过层内和层间的竞争磁相互作用来稳定和增强。因此，这两个因素都促进了具有铁磁相互作用的纳米区域的分离。
The onset of a Griffiths-like phase has been observed in Tb5Si2Ge2 (T-C=110 K) by means of magnetic susceptibility and small-angle neutron scattering experiments. We show the growth of a ferromagnetic cluster system characterized by an inverse susceptibility exponent lower than unity at T-C < T < T-G approximate to 200 K. We suggest that the Griffiths-like state is originated by local disorder within the crystallographic structure, stabilized and enhanced by competing intralayer and interlayer magnetic interactions. Both factors thus promote segregation of nanometric regions with ferromagnetic interactions.