Work

Absence of magnetic order and magnetic fluctuations in RuO 2

Year: 2025

Type: article

Abstract: A novel magnetic class blending ferromagnetism and antiferromagnetism, termed altermagnetism, has gained significant attention for its staggered order in coordinate and momentum spaces, time-reversal symmetry-breaking phenomena, and promising applications in spintronics. Ruthenium dioxide (${\mathrm{RuO}}_{2}$) has been considered a candidate material for altermagnetism, yet the presence of magnetic moments on Ru atoms remains a subject of debate. In this study, we systematically investigated the magnetic properties of ${\mathrm{RuO}}_{2}$ powder using nuclear quadrupole resonance (NQR) measurements. The NQR spectra show that there is no internal magnetic field. Furthermore, the temperature independence of spin-lattice relaxation rate, $1/{T}_{1}T$, proves that there are no magnetic fluctuations. Our results unambiguously demonstrate that Ru atoms in ${\mathrm{RuO}}_{2}$ possess neither static magnetic moments nor fluctuating magnetic moments, and thus ${\mathrm{RuO}}_{2}$ does not possess the magnetic characteristics essential for altermagnetism.

Source: Physical review. B./Physical review. B

DOI: 10.1103/cb99-6thg