Constraints on magnetism and correlations in RuO${}_2$ from lattice dynamics and Mössbauer spectroscopy

Abstract

We provide experimental evidence for the absence of a magnetic moment in bulk RuO${}_2$, a candidate altermagnetic material, by using a combination of Mössbauer spectroscopy, nuclear forward scattering, inelastic X-ray and neutron scattering, and density functional theory calculations. Using complementary Mössbauer and nuclear forward scattering we determine the ${}^{99}$Ru magnetic hyperfine splitting to be negligible. Inelastic X-ray and neutron scattering derived lattice dynamics of RuO${}_2$ are compared to density functional theory calculations of varying flavors. Comparisons among theory with experiments indicate that electronic correlations, rather than magnetic order, are key in describing the lattice dynamics.

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Cited by in corpus (2)

• Observation of mirror-odd and mirror-even spin texture in ultrathin epitaxially strained RuO2 films
• T-square electric resistivity and its thermal counterpart in RuO${}_2$