Deteriorated Interlayer Coupling in Twisted Bilayer Cobaltites
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.
Authors
- Gang‐Qin Liu (ORCID: https://orcid.org/0000-0002-6121-6927)
- Qiang Zheng (ORCID: https://orcid.org/0000-0002-9279-7779)
- Kuijuan Jin (ORCID: https://orcid.org/0000-0002-0047-4375)
- Yan‐Xing Shang (ORCID: https://orcid.org/0000-0002-7839-0884)
- Er‐Jia Guo (ORCID: https://orcid.org/0000-0001-5702-225X)
- Yu Deng (ORCID: https://orcid.org/0000-0002-5603-2859)
- Shengru Chen (ORCID: https://orcid.org/0000-0002-7656-2427)
- Qinghua Zhang (ORCID: https://orcid.org/0000-0002-3815-8108)
- Chen Ge (ORCID: https://orcid.org/0000-0002-8093-940X)
- Jinfeng Zhang (ORCID: https://orcid.org/0000-0003-1771-5187)
- Can Wang (ORCID: https://orcid.org/0000-0002-4404-7957)
- Yue Xu (ORCID: https://orcid.org/0009-0006-2151-4694)
- Lingfei Wang (ORCID: https://orcid.org/0000-0003-1675-0941)
- Xiuqi Chen (ORCID: https://orcid.org/0000-0002-2862-7206)
- Haitao Hong
- Ting Cui (ORCID: https://orcid.org/0000-0001-8817-5865)
- Qiyao Wang (ORCID: https://orcid.org/0000-0003-0462-3160)
- Dongke Rong
Institutions
- University of Science and Technology of China (CN)
- Chinese Academy of Sciences (CN)
- Hefei National Center for Physical Sciences at Nanoscale (CN)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- Microscale (United States) (US)
- Collaborative Innovation Center of Advanced Microstructures (CN)
- National Center for Nanoscience and Technology (CN)
- Institute of Physics (CN)
- University of Chinese Academy of Sciences (CN)
- Zhejiang University (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-03-31
- DOI
- https://doi.org/10.1021/acs.nanolett.5c01538
- Citations
- 6
- Primary Topic
- Electronic and Structural Properties of Oxides
- Type
- article
- Field-Weighted Citation Impact
- 3.11
Funders
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- China Postdoctoral Science Foundation
- Beijing Municipal Natural Science Foundation
- National Key Research and Development Program of China