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The combination of a superconductor with a magnetically inhomogeneousmaterial has been established as an efficient mechanism for the generation oflong-ranged spin-polarized (spin-triplet) Cooper pairs. Evidence for thismechanism, however, has been established based on studies done onthree-dimensional systems, where the strong bonds existing at the interfacebetween the superconductor and the magnetic material should in principleenhance proximity effects and strengthen any electronic correlations. Here, wefabricate devices based on van der Waals stacks of flakes of thetwo-dimensional superconductor NbS2 combined with flakes of Cr1/3NbS2, whichhas a built-in magnetic inhomogeneity due to its helimagnetic spin texture atlow temperatures. We find that the critical temperature of these vdW bilayersis strongly dependent on the magnetic state of Cr1/3NbS2, whose degree ofmagnetic inhomogeneity can be controlled via an applied magnetic field. Ourresults demonstrate evidence for the generation of long-ranged spin-tripletpairs across the Cr1/3NbS2/NbS2 vdW interface.

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