偏振拉曼光谱研究CuO中飞秒尺度离子运动
Unfolding femtoscale ionic movement in CuO through polarized Raman spectroscopy
摘要：
最近，CuO被认为是一种潜在的具有高转变温度的多铁性材料。基于自旋电流和离子位移的竞争模型被调用来解释CuO中的铁电性。预测离子位移的理论模型表明，离子的位移基本上是沿着b轴，幅度很小（~10-5 Ω）。实验检测在特定方向上的如此小幅度的位移是极其具有挑战性的。通过我们对CuO外延膜的详细的偏振拉曼光谱研究，我们验证了理论研究，并提供了沿b轴位移的直接证据。我们的研究为高温多铁性化合物的研究做出了重要贡献，并首次展示了偏振拉曼散射在飞秒尺度上探测离子位移的应用。
英文摘要：
Recently, CuO has been proposed as a potential multiferroic material with high transition temperature. Competing models based on spin current and ionic displacements are invoked to explain ferroelectricity in CuO. The theoretical model predicting ionic displacement suggested that the shift in ions is essentially along b-axis with very small amplitude (~10-5 Å). Experimentally detecting displacements of such a small amplitude in a particular direction is extremely challenging. Through our detailed polarized Raman spectroscopy study on epitaxial film of CuO, we have validated the theoretical study and provided direct evidence of displacement along the b-axis. Our study provides important contribution in the high temperature multiferroic compounds and showed for the first time, the use of the polarized Raman scattering in detecting ionic displacements at the femto-scale.
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