Dynamic motion and freezing of polaronic local structures in a colossal-magnetoresistive perovskite manganite La0.7Ca0.3MnO3 detected with radioactive nuclei
Dynamic motion and freezing of polaronic local structures in a colossal-magnetoresistive perovskite manganite La0.7Ca0.3MnO3 detected with radioactive nuclei
复制标题
用放射性核检测到巨磁阻钙钛矿锰氧化物 La0.7Ca0.3MnO3 中极化子局域结构的动态运动和冻结
DOI：
10.1103/physrevb.100.184111
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发表时间：
2019
影响因子：
3.7
通讯作者：
Ohkubo Y.
中科院分区：
文献类型：
--
作者：
Sato W.;Komatsuda S.;Shimizu H.;Moriichi R.;Abe S.;Watanabe S.;Komatsu S.;Terai T.;Kawata S.;Ohkubo Y.
用时间微分扰动角相关（TDPAC）谱测量了钙钛矿锰氧化物（）中占据La/Casite位的放射性杂质探针的磁超精细场和电场梯度。在室温下的顺磁绝缘体相，theprobes分布在两个不同的环境：扭曲和较少扭曲的网站;而在铁磁金属相以下，扭曲的组件的振荡结构消失的TDPAC功能。振荡的消失归因于双交换相互作用引起的导电电子对极化子的拖曳。在液氦中，动态运动冻结，留下平均的局部变形。本文根据离子探针核处随温度变化的电磁场，讨论了与磁电阻相变到铁磁相有关的局部结构的动态运动和冻结。
The magnetic hyperfine field and electric field gradients at a radioactive impurity probe ofoccupying the La/Casite in a perovskite manganaite() were measured by means of time-differential perturbed angular correlation (TDPAC) spectroscopy. In the paramagnetic-insulator phase at room temperature, theprobes are distributed in two different environments: distorted and less distorted sites; whereas in the ferromagnetic-metal phase below, the oscillatory structure of the distorted component vanishes from the TDPAC function. The vanishing of the oscillation is ascribable to dynamic motion of polarons dragged by conduction electrons induced by the double exchange interaction. In liquid helium, the dynamic motion freezes, leaving averaged local distortion. The dynamic motion and freezing of local structures associated with the colossal-magnetoresistance phase transition to the ferromagnetic phase is discussed on the basis of temperature-dependent electromagnetic fields at the probe nuclei of thesite ions.