Emergent ferromagnetism with superconductivity in Fe(Te,Se) van der Waals Josephson junctions

Gang Qiu (), Hung-Yu Yang, Lunhui Hu, Huairuo Zhang, Chih-Yen Chen, Yanfeng Lyu, Christopher Eckberg, Peng Deng, Sergiy Krylyuk, Albert V. Davydov, Ruixing Zhang and Kang L. Wang ()
Additional contact information
Gang Qiu: University of California
Hung-Yu Yang: University of California
Lunhui Hu: The University of Tennessee, Knoxville
Huairuo Zhang: National Institute of Standards and Technology (NIST)
Chih-Yen Chen: National Yang Ming Chiao Tung University (NYCU)
Yanfeng Lyu: Nanjing University of Posts and Telecommunications
Christopher Eckberg: University of California
Peng Deng: University of California
Sergiy Krylyuk: National Institute of Standards and Technology (NIST)
Albert V. Davydov: National Institute of Standards and Technology (NIST)
Ruixing Zhang: The University of Tennessee, Knoxville
Kang L. Wang: University of California

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Ferromagnetism and superconductivity are two key ingredients for topological superconductors, which can serve as building blocks of fault-tolerant quantum computers. Adversely, ferromagnetism and superconductivity are typically also two hostile orderings competing to align spins in different configurations, and thus making the material design and experimental implementation extremely challenging. A single material platform with concurrent ferromagnetism and superconductivity is actively pursued. In this paper, we fabricate van der Waals Josephson junctions made with iron-based superconductor Fe(Te,Se), and report the global device-level transport signatures of interfacial ferromagnetism emerging with superconducting states for the first time. Magnetic hysteresis in the junction resistance is observed only below the superconducting critical temperature, suggesting an inherent correlation between ferromagnetic and superconducting order parameters. The 0-π phase mixing in the Fraunhofer patterns pinpoints the ferromagnetism on the junction interface. More importantly, a stochastic field-free superconducting diode effect was observed in Josephson junction devices, with a significant diode efficiency up to 10%, which unambiguously confirms the spontaneous time-reversal symmetry breaking. Our work demonstrates a new way to search for topological superconductivity in iron-based superconductors for future high Tc fault-tolerant qubit implementations from a device perspective.

Date: 2023
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DOI: 10.1038/s41467-023-42447-4

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