尖晶石结构铬基氧化物ACr2O4体系，由于存在强的磁阻挫效应，并且体系中自旋、晶格、轨道和电荷自由度之间存在着很强的耦合，因此基态表现出诸多新奇的量子效应。深入研究晶格振动与自旋波激发之间的动力学耦合可以揭示ACr2O4体系中多铁性、磁电耦合和磁致伸缩等奇异物性的微观机制。本项目将主要采用非弹性中子散射技术，拟选取ACr2O4（A = Mn2+, Fe2+,Co2+）为研究对象，直接探测声子和自旋波激发的分布，结合第一性原理等理论计算，重点揭示自旋声子耦合与相关的奇异物性之间的内在联系，从而为理解该体系中奇异物性的起源提供实验方面的指导，也为理论方面建立精准的晶格动力学模型提供可参照的对象。

Due to the strong magnetic frustrated effect and the strong coupling between spin, lattice, orbit and charge degrees of freedom in the chromium spinel oxides ACr2O4, so the ground state presents many fascinating quantum effects. Profound studies of the dynamic coupling between lattice vibration and spin wave excitations can help us to reveal the microscopic mechanism of multiferroicity, magnetoelectric coupling and magnetostriction in ACr2O4 system. In this project, the dispersions of the spin wave and phonon excitations in ACr2O4 (A = Mn2+, Fe2+, Co2+) will be detected directly using inelastic neutron scattering. The combination of inelastic neutron scattering and the first principle theoretical calculations forms an adequate framework to obtain the internal relationship between the spin-phonon coupling and the related fascinating properties, which will provide experimental guidance for the understanding of fascinating properties and references for the theoretical establishment of accurate lattice dynamics model in the system.