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Signature of long-ranged spin triplets across a two-dimensional superconductor/helimagnet van der Waals interface

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2024

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Deutsche Forschungsgemeinschaft (DFG): 443404566
European Union (EU): 964398
Deutsche Forschungsgemeinschaft (DFG): 425217212

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Physical Review Research. American Physical Society (APS). 2024, 6(1), L012046. eISSN 2643-1564. Available under: doi: 10.1103/PhysRevResearch.6.L012046

Zusammenfassung

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 demonstrated based on studies done on thin-film multilayers, 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 (vdW) stacks of flakes of the 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 heterostructures 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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Odd-frequency superconductivity, Proximity effect, Spin-triplet pairing, Superconductivity, Van der Waals systems, Usadel equation

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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, 2024. Signature of long-ranged spin triplets across a two-dimensional superconductor/helimagnet van der Waals interface. In: Physical Review Research. American Physical Society (APS). 2024, 6(1), L012046. eISSN 2643-1564. Available under: doi: 10.1103/PhysRevResearch.6.L012046
BibTex
@article{Spuri2024-03-01Signa-69452,
  year={2024},
  doi={10.1103/PhysRevResearch.6.L012046},
  title={Signature of long-ranged spin triplets across a two-dimensional superconductor/helimagnet van der Waals interface},
  number={1},
  volume={6},
  journal={Physical Review Research},
  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},
  note={Article Number: L012046}
}
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