The Fermi surface of RuO2 measured by quantum oscillations

Abstract

The metallic oxide RuO${}_2$ has emerged as a promising altermagnet candidate, owing to reports of this material hosting antiferromagnetic ordering accompanied by a spin-split electronic band structure characteristic of time-reversal symmetry-breaking. However, recent studies have robustly questioned this scenario. Here we map the Fermi surface of pristine single-crystalline RuO${}_2$. By measuring magnetic quantum oscillations of a bulk thermodynamic property, our study resolves the electronic structure present in the bulk of RuO${}_2$. Several Fermi sheets are discerned, with a range of effective quasiparticle masses up to five times that of the bare electron mass. We compare our measurements with the predictions for altermagnetic and nonmagnetic Fermi surfaces deduced from density functional theory calculations. The quantum oscillatory frequency spectra correspond very poorly to the profile expected for the case of altermagnetism; by contrast, they correspond well to the nonmagnetic scenario. Our findings place significant constraints on the bulk magnetic properties of RuO${}_2$, and strongly suggest that this material is a paramagnet.

References in corpus (26)

• Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
• Crystal Hall effect in Collinear Antiferromagnets
• Observation of the Anomalous Hall Effect in a Collinear Antiferromagnet
• Momentum-Dependent Spin Splitting by Collinear Antiferromagnetic Ordering
• Observation of spin splitting torque in a collinear antiferromagnet RuO2
• Spin current generation in organic antiferromagnets
• Tilted spin current generated by the collinear antiferromagnet RuO2
• Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
• Observation of spin-splitter torque in collinear antiferromagnetic RuO${}_2$
• Antiferromagnetism in RuO${}_2$ as $d$-wave Pomeranchuk instability
• Itinerant Antiferromagnetism in RuO${}_2$
• A multi-component Fermi surface in the vortex state of an underdoped high-Tc superconductor
• Numerical extraction of de Haas - van Alphen frequencies from calculated band energies
• Anomalous Antiferromagnetism in Metallic RuO${}_2$ Determined by Resonant X-ray Scattering
• Nonmagnetic Ground State in RuO${}_2$ Revealed by Muon Spin Rotation
• Absence of altermagnetic spin splitting character in rutile oxide RuO${}_2$
• Fermi surface in the absence of a Fermi liquid in the Kondo insulator SmB${}_6$
• Fragility of the magnetic order in the prototypical altermagnet RuO${}_2$
• Quasi-2D Fermi surface in the anomalous superconductor UTe2
• Fermi-liquid behavior of non-altermagnetic RuO${}_2$
• Quantum oscillations in a centrosymmetric skyrmion-hosting magnet GdRu2Si2
• Enhanced triplet superconductivity in next generation ultraclean UTe2
• Crystal structure and absence of magnetic order in single crystalline RuO${}_2$
• Quantum interference between quasi-2D Fermi surface sheets in UTe2
• Quantum Oscillations and Overcritical Torque Interaction in Sr2RuO4
• Diagnosing Altermagnetic Phases through Quantum Oscillations

Cited by in corpus (6)

• Altermagnetic Flatband-Driven Fermi Surface Geometry for Giant Tunneling Magnetoresistance
• Altermagnetism, ARPES, symmetry, non-relativistic band splitting
• Surface-Localized Magnetic Order in RuO2 Thin Films Revealed by Low-Energy Muon Probes
• Quantum oscillation fingerprints of altermagnetism in hole-doped RuO2
• Fermi-liquid behavior and characteristic temperature-dependent susceptibility in clean RuO${}_2$ crystal
• Theory of Angle Resolved Photoemission Spectroscopy of Altermagnetic Mott Insulators