Strong Correlation Between Superconductivity and Ferromagnetism in an Fe-Chalcogenide Superconductor

McLaughlin, Nathan J.; Gu, Genda; Wang, Hailong; Huang, Mengqi; Lee-Wong, Eric; Hu, Lunhui; Lu, Hanyi; Yan, Gerald Q.; Wu, Congjun; You, Yi-Zhuang; Du, Chunhui R.

doi:10.1021/acs.nanolett.1c02424

Strong Correlation Between Superconductivity and Ferromagnetism in an Fe-Chalcogenide Superconductor

Journal Article · Wed Sep 08 04:00:00 EDT 2021 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.1c02424· OSTI ID:1827162

McLaughlin, Nathan J. ^[1]; ^[2]; Wang, Hailong ^[1]; Huang, Mengqi ^[1]; Lee-Wong, Eric ^[1]; Hu, Lunhui ^[1]; Lu, Hanyi ^[1]; Yan, Gerald Q. ^[1]; Wu, Congjun ^[3]; You, Yi-Zhuang ^[1]; Du, Chunhui R. ^[1]

Univ. of California, San Diego, CA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of California, San Diego, CA (United States); Westlake Univ., Hangzhou (China)

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 FeTe_xSe_1–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 FeTe_xSe_1–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 FeTe_xSe_1–x flakes, demonstrating strong correlation between superconductivity and ferromagnetism in FeTe_xSe_1–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 FeTe_xSe_1–x may also find applications in developing hybrid architectures for next-generation, solid-state-based quantum information technologies.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 1827162

Report Number(s):: BNL--222279-2021-JAAM

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 17 Vol. 21; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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