Neutron, x-ray, and Mössbauer spectroscopy show that bulk RuO₂ lacks magnetic moments, ruling out altermagnetism and providing constraints on electronic correlations models.
Scientific Achievement: Neutron and X-ray scattering show that bulk RuO₂ exhibits a highly correlated ground state without magnetic moments, despite prior claims of altermagnetism.
Significance and Impact: Experimentally-constrained models that decouple electronic correlations from spins emerge that will guide the understanding of correlations in spintronics materials.
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