论文标题
通过电子 - phonon耦合在la $ _ {1.675} $ eu $ _ {0.2} $ sr $ _ {0.125} $ cuo $ _4 $ _4 $ _4 $ _4 $ _4 $ _ {0.2} $ _ {0.2}
Charge Order Lock-in by Electron-Phonon Coupling in La$_{1.675}$Eu$_{0.2}$Sr$_{0.125}$CuO$_4$
论文作者
论文摘要
我们报告了一项超高分辨率分辨率无弹性X射线散射（RIX）研究，对条纹订购的cuprate la $ _ $ _ {1.675} $ _ {0.2} $ _ {0.2} $ _ {0.125} $ cuo $ _ $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _4 $ _ $ _围绕电荷排序波矢量发现了声子软化和寿命缩短。除了这些自我能力效应外，电子 - 音波耦合还通过与RIX横截面的比例探测。我们发现在冷却到低温四方结构相中后，在电荷条纹订购波向量周围的电子音波耦合增强。这些结果表明，除了电子相关性外，电子 - 音波耦合对库酸酯中远程电荷条纹顺序的出现显着贡献。
We report an ultrahigh resolution resonant inelastic x-ray scattering (RIXS) study of the in-plane bond-stretching phonon mode in stripe-ordered cuprate La$_{1.675}$Eu$_{0.2}$Sr$_{0.125}$CuO$_4$. Phonon softening and lifetime shortening are found around the charge ordering wave vector. In addition to these self-energy effects, the electron-phonon coupling is probed by its proportionality to the RIXS cross section. We find an enhancement of the electron-phonon coupling around the charge-stripe ordering wave vector upon cooling into the low-temperature tetragonal structure phase. These results suggest that in addition to electronic correlations, electron-phonon coupling contributes significantly to the emergence of long-range charge-stripe order in cuprates.
