Somesh Chandra, Gurpreet Kaur, Rajkumar Gupta, S. Chakravarty, G. M. Bhalerao, Govindaraj Ramanujam
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引用次数: 0
摘要
使用 785 nm 激发光源对 MgCu2O3 复合物进行了温度高达 83 K 的低温拉曼光谱实验研究。实验获得的拉曼光谱与 DFPT 计算获得的拉曼光谱对比良好。在奈尔温度（约 95 K）以下和以上，声子模式表现出不同的行为。在奈尔温度以上，非谐波贡献非常突出，但在奈尔温度以下，某些 Ag 和 B3g 模式明显偏离了非谐波行为。这种行为归因于化合物中存在的自旋-声子耦合。自旋-声子耦合是由于晶格振动对交换积分的调制而产生的。本文讨论了每种模式的原子振动及其对交换积分的影响。
Evidence of spin-phonon interactions in MgCu2O3: low temperature Raman studies
Experimental low temperature Raman spectroscopy studies upto the temperature of 83 K were performed on MgCu2O3 compound using 785 nm excitation source. Experimentally obtained Raman spectra compare well with those obtained from DFPT calculations. Phonon modes show different behaviour below and above the Néel temperature ~95 K. Anharmonic contribution is prominent above the Néel temperature but a significant departure from the anharmonic behaviour was observed for certain Ag and B3g modes below the Néel temperature. This behaviour is attributed to spin-phonon coupling present in the compound. The spin-phonon coupling arises due to modulation in the exchange integral by the lattice vibrations. The atomic vibrations of each mode and their effect on the exchange integral are discussed.
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