Journal
NANO LETTERS
Volume 21, Issue 17, Pages 7277-7283Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c02424
Keywords
Quantum sensing; Nitrogen vacancy magnetometry; Topological superconductors; Unconventional ferromagnetism
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Funding
- Air Force Office of Scientific Research [FA9550-20-1-0319, FA9550-21-1-0125]
- U.S. National Science Foundation [ECCS-2029558, DMR2046227]
- U.S. Department of Energy, office of Basic Energy Sciences [DOE-sc0012704]
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This study demonstrates nanoscale quantum sensing and imaging of magnetic flux on exfoliated FeTexSe1-x flakes using nitrogen vacancy (NV) centers in diamond, revealing a strong correlation between superconductivity and ferromagnetism in FeTexSe1-x. The coexistence of superconductivity and ferromagnetism in this novel topological superconductor opens up new opportunities for exploring exotic spin and charge transport phenomena in quantum materials. The coupling shown between NV centers and FeTexSe1-x may also have potential applications in developing hybrid architectures for next-generation solid-state-based quantum information technologies.
The interplay among topology, superconductivity, and magnetism promises to bring a plethora of exotic and unintuitive behaviors in emergent quantum materials. The family of Fe-chalcogenide superconductors FeTexSe1-x are directly relevant in this context due to their intrinsic topological band structure, high-temperature superconductivity, and unconventional pairing symmetry. Despite enormous promise and expectation, the local magnetic properties of FeTexSe1-x remain largely unexplored, which prevents a comprehensive understanding of their underlying material properties. Exploiting nitrogen vacancy (NV) centers in diamond, here we report nanoscale quantum sensing and imaging of magnetic flux generated by exfoliated FeTexSe1-x flakes, demonstrating strong correlation between superconductivity and ferromagnetism in FeTexSe1-x. The coexistence of superconductivity and ferromagnetism in an established topological superconductor opens up new opportunities for exploring exotic spin and charge transport phenomena in quantum materials. The demonstrated coupling between NV centers and FeTexSe1-x may also find applications in developing hybrid architectures for next-generation, solid-state-based quantum information technologies.
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