中子衍射
订单(交换)
光谱学
衍射
材料科学
凝聚态物理
核磁共振
物理
业务
光学
量子力学
财务
作者
Philipp Keßler,Laura Garcia-Gassull,A. Suter,T. Prokscha,Z. Salman,D. D. Khalyavin,Pascal Manuel,Fabio Orlandi,I. I. Mazin,Roser Valentí,Simon Moser
标识
DOI:10.1038/s44306-024-00055-y
摘要
Abstract Altermagnets are a novel class of magnetic materials, where magnetic order is staggered both in coordinate and momentum space. The metallic rutile oxide RuO 2 , long believed to be a textbook Pauli paramagnet, recently emerged as a putative workhorse altermagnet when resonant X-ray and neutron scattering studies reported nonzero magnetic moments and long-range collinear order. While some experiments seem consistent with altermagnetism, magnetic order in RuO 2 remains controversial. We show that RuO 2 is nonmagnetic, both in bulk and thin film. Muon spectroscopy complemented by density-functional theory finds at most 1.14 × 10 −4 μ B /Ru in bulk and at most 7.5 × 10 −4 μ B /Ru in 11 nm epitaxial films, at our spectrometers’ detection limit, and dramatically smaller than previously reported neutron results that were used to rationalize altermagnetic behavior. Our own neutron diffraction measurements on RuO 2 single crystals identify multiple scattering as the source for the false signal in earlier studies.
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