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Exploring d-wave magnetism in cuprates from oxygen moments

Ying Li1,2,*, Valentin Leeb1,3,*, Krzysztof Wohlfeld4, Roser Valentí5, and Johannes Knolle1,3,6

  • *These authors contributed equally to this work.

Phys. Rev. B 112, 125139 – Published 17 September, 2025

DOI: https://doi.org/10.1103/vx12-r2k1

Abstract

The antiferromagnetic parent phase of high-Tc cuprates has been established as a Néel state of copper moments, but early work pointed out the important role of ligand oxygen orbitals. Using the three-orbital Emery model, we explore how, and under which conditions, doping-induced antiferromagnetic ordering of weak magnetic moments on the oxygen sites can lead to unconventional d-wave magnetism with spin-split electronic bands. The mechanism for forming such altermagnetic (AM) states in cuprates does not rely on a lowering of the crystal symmetry but rather on interaction-induced formation of magnetic moments on directional oxygen orbitals within the crystallographic unit cell. Therefore, we obtain two different types of AM, namely, a (0, 0)-AM and a (π,π)-AM. We explore different regimes and challenges for realizing oxygen AM supported by Hartree-Fock calculations and complementary exact diagonalization of small clusters. While the region of interacting parameters needed to realize these states may be difficult to achieve in known high-Tc cuprates, we propose a scenario to realize AM induced by oxygen magnetic moments in a cuprate-based candidate compound using density functional theory and discuss experimental implications.

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