Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 52: Altermagnets

MA 52.4: Talk

Friday, March 22, 2024, 10:15–10:30, EB 202

Fragility of the magnetic order in the prototypical altermagnet RuO₂ — •Laura Garcia-Gassull¹, Andriy Smolyanyuk², Igor Mazin³, and Roser Valenti¹ — ¹Goethe University, Frankfurt am Main, Germany — ²Institute of Solid State Physics, Vienna, Austria — ³George Mason University, Fairfax, USA

The search for a material that fulfills the requirements needed to be an altermagnet has been only increasing in recent years. A proposed material, RuO₂, has been at the center of this search. However, its magnetic properties are still controversial, with some experiments pointing towards it being an altermagnet and others a paramagnet. We present first principles electronic structure calculations that show that pristine RuO₂ is not magnetic and that altermagnetism is realized only in the presence of (Ru) vacancies. Moreover, we corroborate NMR experiments that argue for its altermagnetic nature under the effects of vacancies.

Keywords: Altermagnetism; Paramagnetism; vacancies; DFT; NMR