Correlation corrected phonon vibration in YTiO3 and its effect on electronic properties

Correlation corrected phonon vibration in YTiO3 and its effect on electronic properties
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YTiO3 中的相关校正声子振动及其对电子性能的影响

DOI:
10.1209/0295-5075/117/27004
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发表时间:
2017
期刊:
EPL
影响因子:
1.8
通讯作者:
Gang Wu
Gang Wu
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Xiaoping Yang;Gang Wu

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采用广义梯度近似(GGA)及其与库仑关联U相结合的方法,研究了窄t2 g带系统YTiO 3的红外声子振动及其对电子性质的影响。库仑U不仅改善了GGA在电子性质方面的结果,而且也改善了其晶格动力学性质。有效地提高了声子频率,特别是在高频区,这纠正了实验和理论GGA结果之间的差距。更重要的是,我们发现红外激活模对电子性质有显著的影响,并且发现了振动敏感的磁交换相互作用和强的电子-声子耦合。
The infrared (IR) phonon vibration of the narrow t2g band system YTiO3 and its effect on electronic properties are studied using the generalized gradient approximation (GGA) and its combination with Coulomb correlation U. Coulomb U is found to improve the GGA results not only in electronic properties which has been researched frequently, but also in its lattice dynamics. The phonon frequency is increased effectively, especially in high-frequency region, which corrects the gap between experimental and theoretical GGA result. More importantly, IR-active modes are found to affect electronic properties significantly, and we find vibration-sensitive magnetic exchange interaction and strong electron-phonon coupling.
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