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arXiv 1602.04725cond-mat.mtrl-sci
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LiMn2O4中应力诱导的电荷有序化过程

Stress Induced Charge-Ordering Process in LiMn2O4

Yan Chen, Dunji Yu, Ke An

摘要:

在这封信中,我们报告的应力诱导的Mn电荷有序过程中的LiMn 2 O 4尖晶石,证明了由于Jahn-Teller效应的晶格应变演变。原位中子衍射,揭示了这个过程的初始阶段在低应力下,表明在早期的相变,作为一个潜在的电荷有序机制,在电荷受挫的LiMn 2 O 4的优先Mn网站的EG电子本地化。这种转变的初始阶段表现为渐进的晶格和电荷演化,而不显示一级行为。

英文摘要:

In this letter we report the stress induced Mn charge-ordering process in the LiMn2O4 spinel, evidenced by the lattice strain evolutions due to the Jahn-Teller effects. In-situ neutron diffraction, reveals that the initial stage of this process at low stress, indicating the eg electron localization at the preferential Mn sites during the early phase transition, as an underlying charge ordering mechanism in the charge-frustrated LiMn2O4. The initial stage of this transition exhibits as a progressive lattice and charge evolution, without showing a first-order behavior.

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