Absence of magnetic order and magnetic fluctuations in RuO2
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 (RuO2) 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 RuO2 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/T1T, proves that there are no magnetic fluctuations. Our results unambiguously demonstrate that Ru atoms in RuO2 possess neither static magnetic moments nor fluctuating magnetic moments, and thus RuO2 does not possess the magnetic characteristics essential for altermagnetism.
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