Spin–phonon coupling is one of the fundamental interactions in functional materials, indispensable for understanding their unexpected magnetic ground states. Ferromagnetic SrRuO₃ is a correlated metal with the potential for utilization in novel spintronic devices and serves as a promising platform for studying spin–phonon interactions. In this study, we used Raman spectroscopy to identify spin–phonon coupling in SrRuO₃ heterostructures. We deliberately decreased the exchange interactions within SrRuO₃ by reducing system dimensions, which was coherently observed in both temperature-dependent magnetization measurements and phonon spectra. To collect the Raman signals from the very thin (quasi-2D) SrRuO₃ layers while maintaining the layer thickness, we fabricated epitaxial oxide superlattices with 50 repetitions of the layers. We also present polarization-dependent Raman spectra of SrRuO₃, with accurate identification of the Raman modes. These results show that the phonon dynamics of SrRuO₃ is strongly influenced by the spin ordering, which can be efficiently tailored via atomically controlled epitaxial heterostructuring.

中文翻译：

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外延SrRuO3异质结构中的自旋声子耦合。

自旋-声子耦合是功能材料中的基本相互作用之一，对于理解其意外的磁性基态必不可少。铁磁SrRuO ₃是一种相关金属，具有在新型自旋电子器件中利用的潜力，并且是研究自旋-声子相互作用的有前途的平台。在这项研究中，我们使用拉曼光谱法确定SrRuO ₃异质结构中的自旋声子耦合。我们通过减小系统尺寸来故意减少SrRuO ₃内的交换相互作用，这在与温度相关的磁化强度测量和声子光谱中均得到了一致的观察。从非常薄的（准2D）SrRuO ₃收集拉曼信号在保持层厚度的同时，我们制造了具有50个重复层的外延氧化物超晶格。我们还提出了SrRuO _3的偏振相关拉曼光谱，并精确识别了拉曼模式。这些结果表明，SrRuO ₃的声子动力学受自旋有序影响，可以通过原子控制的外延异质结构有效地调整自旋有序。