Layered antiferromagnetic materials have recently emerged as an intriguing subset of the two-dimensional family providing a highly accessible regime with prospects for layer-number-dependent magnetism. Furthermore, transition metal phosphorus trichalcogenides, MPX₃ (M = transition metal; X = chalcogen) provide a platform on which to investigate fundamental interactions between magnetic and lattice degrees of freedom and further explore the developing fields of spintronics and magnonics. Here, we use a combination of temperature dependent Raman spectroscopy and density functional theory to explore magnetic-ordering-dependent interactions between the manganese spin degree of freedom and lattice vibrations of the non-magnetic sub-lattice via a Kramers-Anderson super-exchange pathway in both bulk, and few-layer, manganese phosphorus triselenide (MnPSe₃). We observe a nonlinear temperature-dependent shift of phonon modes predominantly associated with the non-magnetic sub-lattice, revealing their non-trivial spin-phonon coupling below the Néel temperature at 74 K, allowing us to extract mode-specific spin-phonon coupling constants.

层状反铁磁材料最近作为二维家族的一个有趣的子集出现，提供了一种高度可访问的状态，并具有层数依赖性磁性的前景。此外，过渡金属磷三硫属化物 MPX ₃（M = 过渡金属；X = 硫族元素）提供了一个平台，可在其上研究磁自由度和晶格自由度之间的基本相互作用，并进一步探索自旋电子学和磁振子学的发展领域。在这里，我们结合温度相关拉曼光谱和密度泛函理论，通过 Kramers-Anderson 超交换途径探索非磁性亚晶格的锰自旋自由度和晶格振动之间的磁序相关相互作用块状和少层三硒化锰磷 (MnPSe ₃ )。我们观察到主要与非磁性子晶格相关的声子模式的非线性温度依赖性转变，揭示了它们在 74 K 尼尔温度以下的非平凡自旋声子耦合，使我们能够提取模式特定的自旋声子耦合常数。