Physics Colloquium: Long-ranged spin-polarized superconductivity in antiferromagnets
Tuesday, 29. November 2022
15:15 - 16:45
R 513 With coffee and tea afterwards
FB Physik / Prof. Dr. Wolfgang Belzig
Prof. Dr. Jacob Linder / Norwegian University of Science and Technology, Trondheim
A synergy can arise between ferromagnets and superconductors due to the appearance of spin-polarized superconductivity and the unusual spin-dependent properties of quasiparticles in such systems. Whereas the interplay between ferromagnetism and superconductivity has been well-studied in the context of spintronics, much remains to be understood about antiferromagnet/superconductor structures. For instance, a puzzling experimental observation made by several groups is that antiferromagnets, despite the absence of a net spin-polarization, can suppress superconductivity much more than normal metals. In this talk, I will present recent progress on the understanding of the spin-physics that emerges in structures comprised of antiferromagnets and superconductors. I will show how impurity scattering in antiferromagnetic metals act like effective magnetic impurities, which finally explains the abovementioned experimental results. Surprisingly, I will also show that long-ranged spin-polarized superconductivity can arise in antiferromagnets, which opens up entirely new material combinations to be utilized in superconducting spintronics.