掺杂锰氧化物中相干声子与相互交织的电荷-轨道序及磁序的选择性耦合
Selective coupling of coherent phonons to intertwined charge-orbital and magnetic orders in doped manganites
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中文总结 AI 辅助
本研究通过时间分辨X射线衍射和偏振分辨超快光学反射率，发现相干声子可选择性地追踪掺杂锰氧化物中的电荷/轨道序与磁序，并揭示两者间的强微观耦合，为解耦交织的电子和磁动力学提供了时域途径。
中文摘要 AI 辅助
强关联材料具有技术相关功能，如高温超导性和巨磁阻，这些功能源于电子相和磁相的竞争与共存。揭示这些现象背后的微观相互作用仍然具有挑战性，因为自旋、轨道、电荷和晶格自由度本质上相互交织。在此，通过结合时间分辨X射线衍射和偏振分辨超快光学反射率，在La1/4Pr3/8Ca3/8MnO3中，我们揭示了相干声子模式可以选择性地追踪不同的有序相：面内声子响应主要对电荷/轨道序敏感，而c轴声子响应则对磁序敏感。此外，即使仅探测电荷/轨道有序相，也会出现铁磁相关的磁滞现象，表明空间分离的电荷/轨道有序相与铁磁有序相之间存在强烈的微观耦合。这些结果表明，相干声子提供了一条直接的时域途径，用于解开耦合相中相互交织的电子和磁动力学。
英文摘要
Strongly correlated materials feature technologically relevant functionalities such as high-temperature superconductivity and colossal magnetoresistance, which emerges from the competition and coexistence of electronic and magnetic phases. Uncovering the microscopic interactions underlying these phenomena remains challenging because spin, orbital, charge, and lattice degrees of freedom are inherently intertwined. Here, by combining time-resolved X-ray diffraction and polarization-resolved ultrafast optical reflectivity in La1/4Pr3/8Ca3/8MnO3, we reveal that coherent phonon modes can selectively track different ordered phases: the in-plane phonon response is predominantly sensitive to charge/orbital order, and the c-axis phonon response is sensitive to magnetic order. Moreover, a ferromagnetic-related hysteresis emerges even when solely probing the charge/orbital-ordered phase, indicating a strong microscopic coupling between the spatially separated charge/orbital-ordered and ferromagnetic-ordered phases. These results demonstrate that coherent phonons provide a direct time-domain route to disentangle intertwined electronic and magnetic dynamics in coupled phases.
发表机构
- Paul Scherrer Institute（保罗谢勒研究所）
- University of Fribourg（弗里堡大学）
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH（柏林亥姆霍兹材料与能源中心有限公司）
- University of Science and Technology of China（中国科学技术大学）
- Rutgers University（罗格斯大学）
- Lanzhou University（兰州大学）
机构由 AI 辅助整理，请以论文原文为准。
