Abstract
Ferromagnetism (FM) and superconductivity (SC) are two of the most famous macroscopic quantum phenomena. However, nature normally does not allow SC and FM to coexist without significant degradation. Here, the first fully iron-based SC/FM heterostructures, composed of Fe(Te,Se) and Fe3GeTe2, are introduced, and it is shown that this system exhibits both strong FM and high-temperature SC with an atomically sharp interface. From this study, it is also discovered that minute level of various cationic dopants can drive otherwise non-superconducting FeTe films into a SC state. This suggests that the ground state of FeTe is so close to the SC state that it can be driven in and out of the SC state with various other perturbations. Altogether, this shows that Fe-Te-based heterostructures provide a unique opportunity to manipulate magnetism, superconductivity, and topological physics, paving the way toward new superconducting technologies.
| Original language | English |
|---|---|
| Article number | 2418259 |
| Journal | Advanced Functional Materials |
| Volume | 35 |
| Issue number | 25 |
| DOIs | |
| State | Published - Jun 19 2025 |
Funding
This work was supported by Army Research Office's W911NF2010108, MURI W911NF2020166, and the Center for Quantum Materials Synthesis (cQMS), funded by the Gordon and Betty Moore Foundation's EPiQS initiative through Grant No. GBMF10104. X.Y. was supported by the National Natural Science Foundation of China (Grant No. 12304541). The MFM work on FTS/FGT film was supported by the Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, and U.S. Department of Energy under Award No. DE‐SC0018153. The scanning transmission electron microscopy work used the Electron Microscopy resources (the Helios G5 FIB) of the Center for Functional Nanomaterials (CFN), which is a U.S. Department of Energy Office of Science User Facility, at Brookhaven National Laboratory under Contract No. DE‐SC0012704. The XRD work was performed at Oak Ridge National Laboratory. The authors would like to thank G. Kotliar, P. Coleman, J. Pixley, and G. Blumberg at Rutgers University for helpful discussions. This work was supported by Army Research Office's W911NF2010108, MURI W911NF2020166, and the Center for Quantum Materials Synthesis (cQMS), funded by the Gordon and Betty Moore Foundation's EPiQS initiative through Grant No. GBMF10104. X.Y. was supported by the National Natural Science Foundation of China (Grant No. 12304541). The MFM work on FTS/FGT film was supported by the Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, and U.S. Department of Energy under Award No. DE-SC0018153. The scanning transmission electron microscopy work used the Electron Microscopy resources (the Helios G5 FIB) of the Center for Functional Nanomaterials (CFN), which is a U.S. Department of Energy Office of Science User Facility, at Brookhaven National Laboratory under Contract No. DE-SC0012704. The XRD work was performed at Oak Ridge National Laboratory. The authors would like to thank G. Kotliar, P. Coleman, J. Pixley, and G. Blumberg at Rutgers University for helpful discussions.
Keywords
- ferromagnetism
- heterostructure
- iron-based superconductor
- proximity effect
- superconductivity