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The coupling of a superconductor to a different material often results in asystem with unconventional superconducting properties. A conventionalsuperconductor is a perfect diamagnet expelling magnetic fields out of itsvolume, a phenomenon known as Meissner effect. Here, we show that the simpleadsorption of a monolayer of chiral molecules, which are non-magnetic insolution, onto the surface of a conventional superconductor can markedly changeits diamagnetic Meissner response. By measuring the internal magnetic fieldprofile in superconducting Nb thin films under an applied transverse field bylow-energy muon spin rotation spectroscopy, we demonstrate that the local fieldprofile inside Nb is considerably modified upon molecular adsorption in a waythat also depends on the applied field direction. The modification is notlimited to the chiral molecules/Nb interface, but it is long ranged and occursover a length scale comparable to the superconducting coherence length.Zero-field muon spin spectroscopy measurements in combination with ourtheoretical analysis show that odd-frequency spin-triplet states induced by thechiral molecules are responsible for the modification of the Meissner responseobserved inside Nb. These results indicate that a chiralmolecules/superconductor system supports odd-frequency spin-triplet pairs dueto the molecules acting as a spin active layer and therefore they imply thatsuch system can be used as a simpler alternative to superconductor/ferromagnetor superconductor/topological insulator hybrids for the generation andmanipulation of unconventional spin-triplet superconducting states.

Unconventional Meissner screening induced by chiral molecules in a conventional superconductor