标题： 扭曲双层钴氧化物中的退化层间耦合 显示英文标题

标题： Deteriorated Interlayer Coupling in Twisted Bilayer Cobaltites

摘要： 由于库仑排斥和原子间交换相互作用的共存，在磁性氧化物之间的界面上观察到了丰富的显著行为。 尽管之前的研究主要集中在键合的氧化物异质界面，但关于范德华界面磁性的研究仍然很少。 在本研究中，我们将两个具有精确控制扭转角度的自由悬浮钴氧化物堆叠在一起。 扫描透射电子显微镜揭示了清晰且有序的莫尔条纹，这些条纹与扭转角度呈反比关系。 我们使用氮空位（NV）磁力计发现，扭曲区域的居里温度比单层区域降低了约13 K。 这种现象可能与非键合界面中氧离子和过渡金属离子之间的轨道杂化减弱有关。 我们的发现表明，通过扭转调节相关系统中的磁相互作用可能存在一条潜在途径，为发现未知量子态提供了机会。 显示英文摘要

摘要： A wealth of remarkable behaviors is observed at the interfaces between magnetic oxides due to the coexistence of Coulomb repulsion and interatomic exchange interactions. While previous research has focused on bonded oxide heterointerfaces, studies on magnetism in van der Waals interfaces remain rare. In this study, we stacked two freestanding cobaltites with precisely controlled twist angles. Scanning transmission electron microscopy revealed clear and ordered moir\'e patterns, which exhibit an inverse relationship with the twist angle. We found that the Curie temperature in the twisted region is reduced by approximately 13 K compared to the single-layer region using nitrogen-vacancy (NV) magnetometry. This phenomenon may be related to the weakening of the orbital hybridization between oxygen ions and transition metal ions in the unbonded interfaces. Our findings suggest a potential avenue for modulating magnetic interactions in correlated systems through twist, providing opportunities for the discovery of unknown quantum states.