发表机构
Wichita State University（威奇托州立大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过多频磁共振揭示CrCl3中交换相互作用随温度指数演化、偶极相互作用恒定，并观测到半场共振，表明高温下存在短程自旋关联。
AI 中文摘要
理解范德华磁体中的量子相互作用对于实现其在下一代磁性、电子和自旋电子学应用中的潜力至关重要。在本研究中，我们利用多频宽带（1-16 GHz）磁共振技术，在块体单晶CrCl3样品上研究了范德华磁体CrCl3中交换相互作用和偶极-偶极相互作用的演化。我们发现，由于在更高共振场下的交换窄化效应，偶极展宽的低场共振线宽变窄。我们的研究结果表明，当样品温度从室温降至50 K时，交换相互作用呈指数演化。然而，我们发现偶极-偶极相互作用在同一温度范围内保持不变。我们还检测到了室温下的半场磁共振跃迁，表明自旋之间存在稳健的偶极-偶极相互作用。室温下测得自旋间距离为2.4(3) Å。偶极相互作用的演化、半场磁共振的观测以及强交换相互作用表明，在远高于磁全局有序温度的温度下，CrCl3中存在短程有序/关联。本研究还展示了多频电子自旋共振技术在理解范德华磁性材料中量子相互作用和磁关联方面的重要性和敏感性。
英文摘要
Understanding quantum interactions in van der Waals magnets are critical to realizing their potential for next-generation magnetic, electronic, and spintronic applications. In this study, we investigated the evolution of exchange and dipole-dipole interactions in van der Waals magnet CrCl3 using multifrequency broadband (1-16 GHz) magnetic resonance on a bulk single-crystal CrCl3 sample. We found that the dipolar-broadened low-field resonance linewidth narrows due to exchange narrowing at higher resonance fields. Our findings show that the exchange interaction evolves exponentially as we lower the sample temperature from room temperature to 50 K. However, we found that the dipole-dipole interaction remains constant in the same temperature range. We have also detected the half-field magnetic resonance transition at room temperature, indicating a robust dipole-dipole interaction among spins. The measured inter-spin distance is 2.4(3) A at room temperature. The evolution of dipole interactions, the observation of half-field magnetic resonance, and the strong exchange interaction indicate short-range ordering/correlation in CrCl3 at temperatures far above the magnetic global ordering temperature. This study also demonstrates the significance and sensitivity of the multifrequency electron spin resonance technique for understanding quantum interactions and magnetic correlations in van der Waals magnetic materials.
