钛铁矿型 CoTiO$_3$ 的晶格动力学与自发磁介电效应
Lattice dynamics and spontaneous magnetodielectric effect in ilmenite CoTiO$_3$
AI总结：
结合多种光谱技术与DFT计算研究了钛铁矿CoTiO3单晶的晶格动力学，确定了所有声子频率与对称性，并发现其在反铁磁有序温度以下存在自发磁介电效应，为后续研究自旋与声子耦合奠定了基础。
摘要：
钛铁矿型晶体因其独特的物理性质而在众多技术领域获得应用。我们通过极化红外、Raman 和介电光谱技术，并结合 DFT 计算，对蜂窝状反铁磁钛铁矿 CoTiO$_3$ 单晶的晶格动力学进行了研究。所有预测的红外和 Raman 活性声子的频率与对称性均被唯一确定。此外，研究发现由于自发磁介电效应，介电常数在零磁场下于反铁磁有序温度以下表现出明显变化。我们的结果为深入研究该材料中声子与自旋、磁激发等物理现象的耦合奠定了可靠基础。
英文摘要：
Ilmenite-type crystals find a variety of technological applications due to their intriguing physical properties. We present the results of the lattice dynamics studies of honeycomb antiferromagnetic ilmenite CoTiO$_3$ single crystal by the complementary polarized infrared, Raman, and dielectric spectroscopic techniques that are supplemented by the DFT calculations. The frequencies and symmetries of all predicted infrared and Raman active phonons were uniquely identified. Furthermore, it was found that the dielectric permittivity demonstrates distinct changes below antiferromagnetic ordering temperature in zero magnetic field due to spontaneous magnetodielectric effect. Our results establish the reliable basis for further investigation of the coupling of phonons with spins, magnetic excitations and other physical phenomena of this promising material.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
