Rapid supercurrent decay in Mn$_5$Si$_3$ Josephson junctions

[2608.14842] Rapid supercurrent decay in Mn$_5$Si$_3$ Josephson junctions Skip to main content Search Submit Donate Log in Search arXiv Press Enter to search · Advanced search Condensed Matter > Superconductivity arXiv:2608.14842 (cond-mat) [Submitted on 14 Aug 2026] Title: Rapid supercurrent decay in Mn$_5$Si$_3$ Josephson junctions Authors: Arjun Sapkota , Kurt Lorenzen , Tyler Kuhn , Juan Gomez , Demet Korucu , Robert M. Klaes , Reza Loloee , Norman O. Birge , Nathan Satchell View a PDF of the paper titled Rapid supercurrent decay in Mn$_5$Si$_3$ Josephson junctions, by Arjun Sapkota and 8 other authors View PDF HTML (experimental) Abstract: Theoretical work predicts that Josephson junctions containing metallic altermagnetic barriers should display $0$-$\pi$ transitions of the critical current as a function of both barrier thickness and temperature, with the decay and oscillation period of the supercurrent depending on the orientation of the crystal axes relative to the transport direction. Motivated by these predictions, and by reports of a compensated magnetic phase attributed to altermagnetism in epitaxial Mn$_5$Si$_3$ thin films, we fabricate and measure Nb/Pt/Mn$_5$Si$_3$/Pt/Nb Josephson junctions varying the thickness of the Mn$_5$Si$_3$ barrier. The critical current decays as a single exponential over more than four orders of magnitude with decay length $\xi_{\text{Mn}_5\text{Si}_3} = 0.31 \pm 0.03$ nm, shorter than reported for Josephson junctions containing the metallic antiferromagnets FeMn, Cr, and NiMn. The Mn$_5$Si$_3$ barrier has an estimated current-perpendicular-to-plane resistivity of $320 \pm 10 \mu\Omega\,$cm. No $0$-$\pi$ transition is resolved at the sampled barrier thicknesses, and the temperature dependence of the critical current of a junction with a 1 nm barrier is smooth and monotonic. We discuss the absence of resolvable transitions in terms of the microstructure of the barrier, its uncertain magnetic phase, and the narrow thickness window imposed by the rapid decay, and identify barriers with well-defined crystalline orientation as the key requirement for future tests of altermagnetic Josephson physics. Comments: 6 pages, 3 figures main text. 4 pages, 2 figures SM Subjects: Superconductivity (cond-mat.supr-con) ; Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Cite as: arXiv:2608.14842 [cond-mat.supr-con] (or arXiv:2608.14842v1 [cond-mat.supr-con] for this version) https://doi.org/10.48550/arXiv.2608.14842 Focus to learn more arXiv-issued DOI via DataCite Submission history From: Nathan Satchell [ view email ] [v1] Fri, 14 Aug 2026 19:35:33 UTC (680 KB) Full-text links: Access Paper: View a PDF of the paper titled Rapid supercurrent decay in Mn$_5$Si$_3$ Josephson junctions, by Arjun Sapkota and 8 other authors View PDF HTML (experimental) TeX Source view license Current browse context: cond-mat.supr-con < prev | next > new | recent | 2026-08 Change to browse by: cond-mat cond-mat.mes-hall References & Citations NASA ADS Google Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... 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