Observation of a Griffiths phase in paramagnetic La1-xSrxMnO3 -: art. no. 257202
Observation of a Griffiths phase in paramagnetic La1-xSrxMnO3 -: art. no. 257202
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DOI：
10.1103/physrevlett.95.257202
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发表时间：
2005-12-16
影响因子：
8.6
通讯作者：
Tokura, Y
中科院分区：
文献类型：
--
作者：
Deisenhofer, J;Braak, D;Tokura, Y
本文报道了用电子自旋共振和磁化率测量的方法，在La1-xSrxMnO_3系统中发现了一个新的三角相区。这一相的特征是在远高于磁有序温度的全局顺磁相内存在铁磁实体。这个相的性质可以用正交相中存在相关猝灭无序引起的Griffith奇点来理解。
We report on the discovery of a novel triangular phase regime in the system La1-xSrxMnO3 by means of electron spin resonance and magnetic susceptibility measurements. This phase is characterized by the coexistence of ferromagnetic entities within the globally paramagnetic phase far above the magnetic ordering temperature. The nature of this phase can be understood in terms of Griffiths singularities arising due to the presence of correlated quenched disorder in the orthorhombic phase.