Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.19: Poster
Montag, 17. März 2025, 15:00–18:00, P4
Proximity induced superconductivity in non-collinear antiferromagnets (NCAFMs) — •Anshuman Padhi1, Prajwal Rigvedi Madhusudan Rao1, Ajin Joy2, Ajesh K Gopi1, Jiho Yoon1, Jae-Chun Jeon1, Banabir Pal1, and Stuart S. P. Parkin1 — 1Max Planck Institute of Microstructure Physics, 06120, Halle (Saale), Germany — 2Indian Institute of Science, 560012, Bengaluru, India
Conversion of spin-singlet Cooper pairs to spin-polarised triplet Cooper pairs has been a significant achievement of proximity induced superconducting hybrids. But they often require multilayed stack of mismatched magnetisation interfacing the superconducting condensate, leading to lower tunability, less flexibility on the choice of materials and lesser densities of converted triplet Cooper pairs. Recently, usage of non-collinear antiferromagents have been shown to host long-ranged supercurrents and owing to their atomic distribution of spins in a Kagome lattice are a prime candidate for triplet superconductivity. In this study we aim to fundamentally understand the proximity effect into two-phases of a Mn-based antiperovskite, by analysing the field-dependence of the critical temperature of the superconducting thin-film interfacing them. The unique spin-texture of such materials, with broken inversion symmetry and the presence of uncompensated moments too, can lead to interesting physics w.r.t. the Andreev levels. Thus we fabricate S/I/NCAFM tunneling devices and perform electrical tunneling measurements to study the probable Andreev levels and the impact of the spin-states on them. This exploratory work aims at a deeper level of understanding of Cooper pair interactions in NCAFMs.
Keywords: Superconducting tunneling; Non-collinear antiferromagnets; Proximity effect; Triplet Cooper pairing; Andreev Bound states