Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 98: Altermagnets
TT 98.6: Vortrag
Freitag, 13. März 2026, 11:00–11:15, CHE/0091
Strongly disordered superconductor-altermagnet heterostructures — •Christian Wiedemann1, Danilo Nikolić2, Matthias Eschrig2, and Wolfgang Belzig1 — 1Universität Konstanz, Konstanz, Germany — 2Universität Greifswald, Greifswald, Germany
Similarly to ferromagnets and antiferromagnets previously [1,2], proximity systems involving superconductors (S) and a recently found class of d-wave magnetic materials known as altermagnets (AM) [3] represent promising platforms for both understanding and applications in superconducting spintronics [4]. Introducing nonmagnetic impurities to systems where superconductivity and altermagnetism coexist can reduce the effect of the altermagnetic exchange field on the critical temperature of the superconductor [5]. We investigate the interplay between the anisotropic altermagnetic influence and the isotropization caused by impurity scattering and its effect on superconductivity in an S/AM bilayer. In particular, we compute the order parameter and the free energy using the quasiclassical Green’s function formalism to find stable superconducting states with a special focus on the regime of high impurity concentrations and strong altermagnetic exchange fields. [1] A. I. Buzidn, Rev. Mod. Phys. 77, 935 (2005)
[2] M. Eschrig, Rep. Prog. Phys. 78, 104501 (2015)
[3] L. Šmejkal et al, Phys. Rev. X 12, 040501 (2022)
[4] S. Chourasia et al, Phys. Rev. B 111, 224503 (2025)
[5] M.M. Vasiakin & A.S. Mel’nikov, PRB, 111, L100502 (2025)
Keywords: Altermagnetism; nonmagnetic Impurities; Proximity Effect; Quasiclassical Green's function theory