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Generation of long-ranged spin-triplet pairs across a two-dimensional superconductor/helimagnet van der Waals interface

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2023

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The combination of a superconductor with a magnetically inhomogeneous material has been established as an efficient mechanism for the generation of long-ranged spin-polarized (spin-triplet) Cooper pairs. Evidence for this mechanism, however, has been established based on studies done on three-dimensional systems, where the strong bonds existing at the interface between the superconductor and the magnetic material should in principle enhance proximity effects and strengthen any electronic correlations. Here, we fabricate devices based on van der Waals stacks of flakes of the two-dimensional superconductor NbS2 combined with flakes of Cr1/3NbS2, which has a built-in magnetic inhomogeneity due to its helimagnetic spin texture at low temperatures. We find that the critical temperature of these vdW bilayers is strongly dependent on the magnetic state of Cr1/3NbS2, whose degree of magnetic inhomogeneity can be controlled via an applied magnetic field. Our results demonstrate evidence for the generation of long-ranged spin-triplet pairs across the Cr1/3NbS2/NbS2 vdW interface.

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530 Physik

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Superconductivity, von der Waals interface, low temperature, spin-triplet pairs

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ISO 690SPURI, Alfredo, Danilo NIKOLIĆ, Subrata CHAKRABORTY, Maya KLANG, Hen ALPERN, Oded MILLO, Hadar STEINBERG, Wolfgang BELZIG, Elke SCHEER, Angelo DI BERNARDO, 2023. Generation of long-ranged spin-triplet pairs across a two-dimensional superconductor/helimagnet van der Waals interface
BibTex
@unpublished{Spuri2023-05-03Gener-66974,
  year={2023},
  title={Generation of long-ranged spin-triplet pairs across a two-dimensional superconductor/helimagnet van der Waals interface},
  author={Spuri, Alfredo and Nikolić, Danilo and Chakraborty, Subrata and Klang, Maya and Alpern, Hen and Millo, Oded and Steinberg, Hadar and Belzig, Wolfgang and Scheer, Elke and Di Bernardo, Angelo}
}
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