论文标题
lamno $ _ {3} $的光电率中中红峰的起源
Origin of the mid-infrared peaks in the optical conductivity of LaMnO$_{3}$
论文作者
论文摘要
我们计算了轨道上有序的lamno $ _3 $的红外电导率频率，并在声子频率和英式频率范围内。我们考虑了轨道交换，Jahn-Teller Electron-Phonon耦合以及Phonon耦合。声子耦合的轨道的基本激发仅是拉曼活跃的，而不是红外活动，而其泛音模式既是拉曼又是红外的。我们的计算重现了在拉曼散射和红外电导率光谱中观察到的1300 cm $^{ - 1} $附近的小峰，这与先前的实验结果一致。
We calculated the infrared conductivity spectrum of orbitally ordered LaMnO$_3$ in phonon frequency and overtone frequency ranges. We considered orbital exchange, Jahn-Teller electron-phonon coupling, and phonon--phonon coupling. The fundamental excitation of the phonon-coupled orbiton was only Raman active, not infrared active, while its overtone modes were both Raman and infrared active. Our calculations reproduced the small peaks near 1300 cm$^{-1}$ observed both in Raman scattering and infrared conductivity spectra, as consistent with previous experimental results.
