Long-range supercurrents through a chiral non-collinear antiferromagnet in 
lateral Josephson junctions

Jeon, Kun-Rok; Hazra, Binoy Krishna; Cho, Kyungjune; Chakraborty, Anirban; Jeon, Jae-Chun; Han, Hyeon; Meyerheim, Holger L.; Kontos, Takis; Parkin, Stuart S. P.

doi:10.1038/s41563-021-01061-9

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Long-range supercurrents through a chiral non-collinear antiferromagnet in lateral Josephson junctions

MPS-Authors

/persons/resource/persons263243

Jeon, Kun-Rok
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons260878

Hazra, Binoy Krishna
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons263211

Cho, Kyungjune
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons265540

Chakraborty, Anirban
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons262335

Jeon, Jae-Chun
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons260920

Han, Hyeon
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons260281

Meyerheim, Holger L.
Department of Synthetic Materials and Functional Devices (SMFD), Max Planck Institute of Microstructure Physics, Max Planck Society;

/persons/resource/persons245678

Parkin, Stuart S. P.
Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://doi.org/10.1038/s41563-021-01061-9
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Citation

Jeon, K.-R., Hazra, B. K., Cho, K., Chakraborty, A., Jeon, J.-C., Han, H., et al. (2021). Long-range supercurrents through a chiral non-collinear antiferromagnet in lateral Josephson junctions. Nature Materials. doi:10.1038/s41563-021-01061-9.

Cite as: https://hdl.handle.net/21.11116/0000-0009-2FB5-7

Abstract

The proximity-coupling of a chiral non-collinear antiferromagnet (AFM)^1,2,3,4,5 with a singlet superconductor allows spin-unpolarized singlet Cooper pairs to be converted into spin-polarized triplet pairs^6,7,8, thereby enabling non-dissipative, long-range spin correlations^{9,10,11,12,13,14}. The mechanism of this conversion derives from fictitious magnetic fields that are created by a non-zero Berry phase¹⁵ in AFMs with non-collinear atomic-scale spin arrangements^1,2,3,4,5. Here we report long-ranged lateral Josephson supercurrents through an epitaxial thin film of the triangular chiral AFM Mn₃Ge (refs. ^3,4,5). The Josephson supercurrents in this chiral AFM decay by approximately one to two orders of magnitude slower than would be expected for singlet pair correlations^{9,10,11,12,13,14} and their response to an external magnetic field reflects a clear spatial quantum interference. Given the long-range supercurrents present in both single- and mixed-phase Mn₃Ge, but absent in a collinear AFM IrMn¹⁶, our results pave a way for the topological generation of spin-polarized triplet pairs^6,7,8 via Berry phase engineering¹⁵ of the chiral AFMs.