Fragile Unconventional Magnetism in RuO${}_2$ by Proximity to Landau-Pomeranchuk Instability

Abstract

Altermagnetism has attracted considerable attention for its remarkable combination of spin-polarized band structures and zero net magnetization, making it a promising candidate for spintronics applications. We demonstrate that this magnetic phase represents a case of ``unconventional magnetism," first proposed nearly two decades ago by one of the present authors as part of a broader framework for understanding Landau-Pomeranchuk instabilities in the spin channel, driven by many-body interactions. By systematically analyzing the altermagnetism in RuO${}_2$ with first-principles calculations, we reconcile conflicting experimental and theoretical reports by attributing it to RuO${}_2$'s proximity to a quantum phase transition. We emphasize the critical role of tuning parameters, such as the Hubbard $U$, hole doping, and epitaxial strain, in modulating quasiparticle interactions near the Fermi surface. This work provides fresh insights into the origin and tunability of altermagnetism in RuO${}_2$, highlighting its potential as a platform for investigating quantum phase transitions and the broader realm of unconventional magnetism.

6 pages, 3 fugures

References in corpus (21)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
• Observation of the Anomalous Hall Effect in a Collinear Antiferromagnet
• Efficient Electrical Spin-Splitter Based on Non-Relativistic Collinear Antiferromagnetism
• Observation of spin splitting torque in a collinear antiferromagnet RuO2
• Tilted spin current generated by the collinear antiferromagnet RuO2
• Observation of spin-splitter torque in collinear antiferromagnetic RuO${}_2$
• Antiferromagnetism in RuO${}_2$ as $d$-wave Pomeranchuk instability
• Itinerant Antiferromagnetism in RuO${}_2$
• Fermi liquid instabilities in the spin channel
• Enumeration and representation theory of spin space groups
• Nonmagnetic Ground State in RuO${}_2$ Revealed by Muon Spin Rotation
• Absence of altermagnetic spin splitting character in rutile oxide RuO${}_2$
• Spin Space Groups: Full Classification and Applications
• Enumeration of spin-space groups: Towards a complete description of symmetries of magnetic orders
• Dynamic generation of spin orbit coupling
• Saturation of the anomalous Hall effect at high magnetic fields in altermagnetic RuO2
• Fragility of the magnetic order in the prototypical altermagnet RuO${}_2$
• Realizing Altermagnetism in Fermi-Hubbard Models with Ultracold Atoms
• Unconventional metamagnetic electron states in orbital band systems

Cited by in corpus (13)

• Two-Dimensional Ferroelectric Altermagnets: From Model to Material Realization
• Two-dimensional Dual-Switchable Ferroelectric Altermagnets: Altering Electrons and Magnons
• Spin-Splitting Magnetoresistance in Altermagnetic RuO2 Thin Films
• Lithium and Vanadium Intercalation into Bilayer V2Se2O: Ferrimagnetic-Ferroelastic Multiferroics and Anomalous and Spin Transport
• Exploration of Altermagnetism in $\mathrm{Ru}{\mathrm{O}}_2$
• Observation of mirror-odd and mirror-even spin texture in ultrathin epitaxially strained RuO2 films
• Altermagnetism, ARPES, symmetry, non-relativistic band splitting
• Ferromagnetic interface engineering of spin-charge conversion in RuO${}_2$
• $d$-Wave Polarization-Spin Locking in Two-Dimensional Altermagnets
• Fermi liquid theory of $d$-wave altermagnets: demon modes and Fano-demon states
• Marginal Metals and Kosterlitz-Thouless Type Phase Transition in Disordered Altermagnets
• Quantum oscillation fingerprints of altermagnetism in hole-doped RuO2
• Pairing-induced Momentum-space Magnetism and Its Implication In Optical Anomalous Hall Effect In Chiral Superconductors