论文标题
griffiths阶段和自发交换偏见$ _ {1.5} $ sr $ _ {0.5} $ comn $ _ {0.5} $ _ {0.5} $ fe $ _ {0.5} $ _ {6} $
Griffiths phase and spontaneous exchange bias in La$_{1.5}$Sr$_{0.5}$CoMn$_{0.5}$Fe$_{0.5}$O$_{6}$
论文作者
论文摘要
LA $ _ {1.5} $ SR $ _ {0.5} $ COMN $ _ {0.5} $ fe $ _ {0.5} $ o $ $ _ {6} $（LSCMFO）化合物由固态反应及其结构，电子和磁性属性制备。菱形$ r \ bar {3} c $结构中的材料形成，并且存在独特的磁相互作用会导致在其FM过渡温度（150 K）上方形成Griffiths阶段，这可能与小型短距离的小型铁磁簇的成核有关。在低温下，旋转玻璃样相位出现，系统表现出常规交换偏置（EB）效应。这些结果类似于La $ _ {1.5} $ sr $ _ {0.5} $ comno $ _ {6} $报告的结果，但是当Fe部分替代CO IN时发现的那些是不差的。 la $ _ {1.5} $ sr $ _ {0.5} $（CO $ _ {1-x} $ fe $ _ {x} $）mno $ _ {6} $，对于在更广泛的温度范围内观察到EB效应。讨论了LSCMFO观察到的单向各向异性，并将其与类似于双植矿化合物的各向异性进行了比较，并根据其结构和电子性质进行了合理的解释。
La$_{1.5}$Sr$_{0.5}$CoMn$_{0.5}$Fe$_{0.5}$O$_{6}$ (LSCMFO) compound was prepared by solid state reaction and its structural, electronic and magnetic properties were investigated. The material forms in rhombohedral $R\bar{3}c$ structure, and the presence of distinct magnetic interactions leads to the formation of a Griffiths phase above its FM transition temperature (150 K), possibly related to the nucleation of small short-ranged ferromagnetic clusters. At low temperatures, a spin glass-like phase emerges and the system exhibits both the conventional and the spontaneous exchange bias (EB) effects. These results resemble those reported for La$_{1.5}$Sr$_{0.5}$CoMnO$_{6}$ but are discrepant to those found when Fe partially substitutes Co in La$_{1.5}$Sr$_{0.5}$(Co$_{1-x}$Fe$_{x}$)MnO$_{6}$, for which the EB effect is observed in a much broader temperature range. The unidirectional anisotropy observed for LSCMFO is discussed and compared with those of resembling double-perovskite compounds, being plausibly explained in terms of its structural and electronic properties.
