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首页> 外文期刊>Advances in Natural Sciences >SPIN-CLUSTERING AND GLASSY BEHAVIOUR IN SOME COBALTITES AND MANGANITES
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SPIN-CLUSTERING AND GLASSY BEHAVIOUR IN SOME COBALTITES AND MANGANITES

机译：某些钴酸盐和锰矿中的自发簇聚和玻璃化行为

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摘要

Magnetic inhomogeneities that are probably caused by the phase segregation are found to exist in most of the R_(1-x)A'_xMO_3 (R - La, Nd, Y; A' = Sr; M = Mn, Co) compounds studied. The effects of phase segregation are more pronounced in La_(1-x)Sr_xCoO_3 where the sintering conditions are found to influence strongly on the magnetic properties of the system. Dynamic studies in low fields show that all of the studied compounds exhibit similarities with magnetically frustrated systems indicating a coexistence of competing interactions. The effects of frustration are even found in Nd_(0.7)Sr_(0.3)MnO_3; a CMR ferromagnet. In the compounds where the ferromagnetism is sufficiently diluted and/or weakened such as Nd_(0.7)Sr_(0.3)Mn_(1-y)Mg_yO_3 with y ≥ 0.2 and La_(0.95)Sr_(0.05)CoO_3 the spin-glass (SG) behaviour is clearly observed. While La_(0.5)Sr_(0.5)CoO_3 ,that was named "cluster-glass" (CG) in previous studies, shows many similarities with re-entrant ferromagnets the magnetic properties of Y_(0.7)Sr_(0.3)MnO_3 support a true CG system where short-range ferromagnetic correlations at high temperatures evolve to a SG state with lowering temperature.
机译：发现大多数研究的R_（1-x）A'_xMO_3（R-La，Nd，Y; A'= Sr; M = Mn，Co）化合物中存在可能由相分离引起的磁不均匀性。相分离的影响在La_（1-x）Sr_xCoO_3中更为明显，在该处发现烧结条件对系统的磁性能有很大影响。在低磁场中的动态研究表明，所有研究的化合物均与受磁阻系统相似，表明存在相互竞争的相互作用。挫折的影响甚至出现在Nd_（0.7）Sr_（0.3）MnO_3中。 CMR铁磁体。在铁磁性被充分稀释和/或减弱的化合物中，例如y≥0.2的La（0.95）Sr_（0.05）CoO_3的Nd_（0.7）Sr_（0.3）Mn_（1-y）Mg_yO_3和自旋玻璃（SG ）行为被清楚地观察到。 La_（0.5）Sr_（0.5）CoO_3在先前的研究中被称为“簇状玻璃”（CG），显示出与凹角铁磁体的许多相似之处，Y_（0.7）Sr_（0.3）MnO_3的磁性支持了高温下短距离铁磁相关性随着温度降低而演变成SG状态的CG系统。

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