论文标题
Ru取代的非磁绝缘体CAHFO3中低温玻璃动力学的出现
Emergence of low temperature glassy dynamics in Ru substituted non magnetic insulator CaHfO3
论文作者
论文摘要
通过过渡金属取代引入的磁性磁性的非磁绝缘子/半导体是Spintronic，Magnetoelectronics和Magneto光学设备领域中有前途的材料之一。在这种情况下，在这里，我们专注于通过在HF位点取代4D元素RU在非磁绝缘子CAHFO3中引起的磁性。结构研究表明，替代Ru4+（高达50％）不会影响母体化合物的原始晶体结构。磁性研究将跨界从二磁性降为顺磁状态，并取代为20％。进一步替换HF导致CAHF1-XRUXO3中的玻璃磁态（0.3 <x <0.5）。通过Vogel Fulcher和Power Law以及磁记忆效应和放松动力学确认了这些组合物中低温玻璃度（低于20 K）的性质。观察到的玻璃度通过现象学等级模型来解释。我们的研究表明，在非磁绝缘体CAHFO3中随机排列的RU阳离子之间存在竞争的短距离相互作用，负责该系列中观察到的低温磁态，成分> 0.25。
Non magnetic insulators/semiconductors with induced magnetism introduced via transition metal substitution are one of the promising materials in the field of spintronic, magnetoelectronics and magneto optical devices. In this context, here, we focus on magnetism induced in a non magnetic insulator CaHfO3, by the substitution of 4d element Ru, at Hf site. Structural investigations indicate that substitution of Ru4+ (up to 50%) does not affect the original crystal structure of the parent compound. Magnetic studies divulge a crossover from a diamagnetic to paramagnetic state with 20% Ru substitution. Further replacement of Hf results in a glassy magnetic state in CaHf1-xRuxO3 (0.3 < x < 0.5). The nature of the low temperature glassiness (below 20 K) in these compositions is confirmed through Vogel Fulcher and Power law, along with, magnetic memory effect and relaxation dynamics. The observed glassiness is explained through the phenomenological hierarchical model. Our studies indicate that the presence of competing short range interactions among randomly arranged Ru cations in non magnetic insulator CaHfO3 are responsible for the observed low temperature magnetic state in this series with compositions > 0.25.
