Abstract A new ternary compound Sm 2 Ni 0.87 Si 2.87 , belonging to intermetallic R 2 TX 3 family ( R = rare-earth, T = transition metals, X = Si, Ge, etc. ), could be synthesized in single phase only by the deliberate introduction of lattice vacancies in the Ni and Si sites. The detailed studies of heat capacity as well as dc and ac magnetization including different non-equilibrium dynamical behaviour, viz. , aging effect, temperature and field dependent magnetic relaxation and magnetic memory effect establish the compound to be a cluster-glass material having a spin freezing temperature ∼6.6 K. To understand the nature of the glassy phase, experimental results have been analysed using a few different theoretical models and found that the observed magnetic memory effect favours the hierarchical model over the droplet model. Competing exchange interaction driven magnetic phase inhomogeneity could be further confirmed through exchange bias effect. The observed magnetic phase inhomogeneity has been attributed to random magnetic anisotropy that develops due to local environmental variations between the rare-earth ions.

中文翻译：

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受挫金属间化合物中的磁相不均匀性 Sm 2 Ni 0.87 Si 2.87

摘要 一种新的三元化合物 Sm 2 Ni 0.87 Si 2.87 属于金属间化合物 R 2 TX 3 族（R = 稀土，T = 过渡金属，X = Si、Ge 等），只能通过单相合成在 Ni 和 Si 位点故意引入晶格空位。热容量以及直流和交流磁化强度的详细研究，包括不同的非平衡动力学行为，即。、老化效应、温度和场相关的磁弛豫和磁记忆效应使该化合物成为自旋凝固温度约为 6.6 K 的簇状玻璃材料。为了了解玻璃相的性质，已使用一些分析了实验结果不同的理论模型，发现观察到的磁记忆效应有利于分层模型而不是液滴模型。通过交换偏置效应可以进一步证实竞争交换相互作用驱动的磁相不均匀性。观察到的磁相不均匀性归因于由于稀土离子之间的局部环境变化而产生的随机磁各向异性。