Superconductivity and magnetism are antigonistic orders. Coupling them in heterostructures enables many twists for manipulating electronic states. Conventional superconductivity arises from the pairing of electrons into Cooper pairs forming singlet spin states. In this work, we show, through Josephson supercurrent measurements, that conventional Cooper pairs can be transformed into unconventional ones (in the triplet spin state) by injecting them in a chiral anti-ferromagnet. These results could have important implications on our understanding of the interplay of superconductivity and magnetic textures and could enable the engineering of new phases of matter.
Nb/Mn3Ge/Nb lateral Josephson junctions
Jeon, KR., Hazra, B.K., Cho, K. et al. Long-range supercurrents through a chiral non-collinear antiferromagnet in lateral Josephson junctions. Nat. Mater. 20, 1358–1363 (2021).
Laboratoire de physique de L’École normale supérieure (LPENS, ENS Paris/CNRS/Sorbonne Université/Université de Paris)