Weak-Coupling Theory of Neutron Scattering as a Probe of Altermagnetism

Understand

Inelastic neutron scattering provides a powerful probe of the magnetic excitations of quantum magnets.

• Altermagnets have recently emerged as a new class of magnets with vanishing net magnetization characteristic of antiferromagnets and with a spin-split electronic structure typical of ferromagnets.
• Here we introduce a minimal Hubbard model with two-sublattice orthorhombic anisotropy as a framework to study altermagnetism.
• Using unrestricted Hartree-Fock calculations, we find an altermagnetic state for this model that evolves from a metallic state to an insulating state with increasing Hubbard-$U$ Coulomb repulsion.