Year: 2025
Type: article
Abstract: 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 moiré patterns, which exhibit an inverse relationship with the twist angle. We observed that the Curie temperature in the twisted region is lower than that in the single-layer region and varies systematically with the twist angle. 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.
Source: Nano Letters
Institutions: Chinese Academy of Sciences, Institute of Physics, University of Chinese Academy of Sciences, Zhejiang University, University of Science and Technology of China, National Center for Nanoscience and Technology, Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Funders: National Natural Science Foundation of China, Chinese Academy of Sciences, Beijing Normal University, China Postdoctoral Science Foundation, Beijing Institute of Technology, Peking University, Beijing Municipal Natural Science Foundation, National Key Research and Development Program of China
OpenAlex ID: W4409017424