Dresden 2026 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 33: Altermagnets IV

MA 33.6: Vortrag

Mittwoch, 11. März 2026, 16:15–16:30, HSZ/0002

Emergent d-Wave Order from Altermagnetic Symmetry in Cuprate and Nickelate Superconductors — •Tom G. Saunderson¹, James F. Annett², and Samir Lounis¹ — ¹Institute of Physics and Halle-Berlin-Regensburg Cluster of Excellence CCE, Martin-Luther-University Halle-Wittenberg, Halle(Saale) 06120, Germany — ²H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8-1TL, United Kingdom

Since the discovery of cuprate high-T_c superconductivity, numerous theoretical frameworks have been proposed to explain its mechanism. Anderson’s RVB picture [1] and U(1) gauge theory [2], for example, motivate a minimal one-band description that largely integrates out the role of oxygen. By contrast, ‘altermagnetism’ [3] produces a d-wave like k-space magnetic texture originating from alternatingly rotated nonmagnetic cages. In this talk, we take the central ideas of altermagnetism and apply them to both cuprate and nickelate families of superconductors. We show that the in-plane oxygen sublattice of CuO₂/NiO₂ layers, ubiquitous in these materials, intrinsically realizes the same symmetry. By imposing an oxygen-centered, staggered s-wave pairing, one obtains a d-wave gap with perfect C₄ symmetry, demonstrated self-consistently in NdNiO₂ from first principles. This description of superconductivity enables a direct mapping between a real-space order parameter and a lattice-based picture, opening the possibility of treating superconductivity and Hubbard-model physics on the same footing. [1] Science 235, 1196 (1987); [2] Phys. Rev. Lett. 76, 503 (1996); [3] Phys. Rev. X 12, 031042 (2022).

Keywords: Magnetism; Superconductivity