Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 47: Altermagnets III

MA 47.2: Talk

Friday, March 21, 2025, 09:45–10:00, H20

Phonon-mediated unconventional superconductivity in altermagnets: A solid-state analog of the A_1 phase of superfluid Helium 3 — •Kristoffer Leraand¹, Kristian Maeland², and Asle Sudbø¹ — ¹Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway — ²Institute for Theoretical Physics and Astrophysics, University of Würzburg, D-97074 Würzburg, Germany

We have considered the possibility of phonon-mediated unconventional superconductivity in a recently discovered new class of antiferromagnets, dubbed altermagnets. Within a weak-coupling approach, and using a minimal band model for altermagnets [1], we have found a dominant superconducting instability odd in momentum and even in spin with fully spin-polarized Cooper pairs, a 2D solid-state analog of the A_1-phase of superfluid Helium 3 [2]. We discuss the origin of this unusual result in terms of phonon-modes and electron form factors. [1] B. Brekke, A. Brataas, and A. Sudbø, PRB 108, 224421 (2023). [2] G. Volovik, The Universe in a Helium Droplet, Oxford Science Publications (2003). Work supported by Norwegian Research Council, through Grant No. 262633, "Center of Excellence on Quantum Spintronics", as well as Grant No. 323766.

Keywords: Altermagnets; Phonons; Unconventional superconductivity; Phonon-mediated superconductivity