Discovery of a metallic room-temperature d-wave altermagnet KV2Se2O

Abstract

Beyond conventional ferromagnetism and antiferromagnetism, altermagnetism is a recently discovered unconventional magnetic phase characterized by time-reversal symmetry breaking and spin-split band structures in materials with zero net magnetization. This distinct magnetic phase not only enriches the understanding of fundamental physical concepts but also has profound impacts on condense-matter physics research and practical device applications. Spin-polarized band structures have been recently observed in semiconductors MnTe and MnTe2 with vanishing net magnetization, confirming the existence of this unconventional magnetic order. Metallic altermagnets have unique advantages for exploring novel physical phenomena related to low-energy quasiparticle excitations and for applications in spintronics as electrical conductivity in metals allows the direct manipulation of spin current through electric field. Here, through comprehensive characterization and analysis of the magnetic and electronic structures of KV2Se2O, we have unambiguously demonstrated a metallic room-temperature altermaget with d-wave spin-momentum locking. The highly anisotropic spin-polarized Fermi surfaces and the spin-density-wave order emerging in the altermagnetic phase make it an extraordinary platform for designing high-performance spintronic devices and studying many-body effects coupled with the unconventional magnetism.

25 pages, 7 figures

References in corpus (17)

• Multifunctional Antiferromagnetic Materials with Giant Piezomagnetism and Noncollinear Spin Current
• Observation of spin splitting torque in a collinear antiferromagnet RuO2
• Broken Kramers' degeneracy in altermagnetic MnTe
• Tilted spin current generated by the collinear antiferromagnet RuO2
• Direct observation of altermagnetic band splitting in CrSb thin films
• Observation of spin-splitter torque in collinear antiferromagnetic RuO${}_2$
• Unfolding first-principles band structures
• Observation of Giant Band Splitting in Altermagnetic MnTe
• Itinerant Antiferromagnetism in RuO${}_2$
• Observation of plaid-like spin splitting in a noncoplanar antiferromagnet
• Large band-splitting in $g$-wave type altermagnet CrSb
• Nonmagnetic Ground State in RuO${}_2$ Revealed by Muon Spin Rotation
• Three-dimensional mapping of the altermagnetic spin splitting in CrSb
• Observation of Spin Splitting in Room-Temperature Metallic Antiferromagnet CrSb
• Symmetry invariants and classes of quasiparticles in magnetically ordered systems having weak spin-orbit coupling
• Observation of Giant Spin Splitting and d-wave Spin Texture in Room Temperature Altermagnet RuO2
• Macroscopic time reversal symmetry breaking by staggered spin-momentum interaction

Cited by in corpus (83)

• Two-Dimensional Ferroelectric Altermagnets: From Model to Material Realization
• Spin-Polarized Antiferromagnetic Spintronics
• Catalogue of $C$-paired spin-momentum locking in antiferromagnetic systems
• Electrical switching of altermagnetism
• Two-dimensional Dual-Switchable Ferroelectric Altermagnets: Altering Electrons and Magnons
• Spin-polarized Specular Andreev Reflections in Altermagnets
• Emergent Multiferroic Altermagnets and Spin Control via Noncollinear Molecular Polarization
• Contrasting Light-Induced Spin Torque in Antiferromagnetic and Altermagnetic Systems
• Tuning of altermagnetism by strain
• All-electrically controlled spintronics in altermagnetic heterostructures
• Tunneling Magnetoresistance Effect in Altermagnets
• Strain controlled g- to d-wave transition in altermagnetic CrSb
• Spin and pair density waves in 2D altermagnetic metals
• Phonon-mediated spin-polarized superconductivity in altermagnets
• Intra-unit-cell singlet pairing mediated by altermagnetic fluctuations
• Multi-component altermagnet: A general approach to generating multi-component structures with two-dimensional altermagnetism
• Ferroelasticity tunable altermagnets
• The electronic structures, magnetic transition and Fermi surface instability of room-temperature altermagnet KV${}_2$Se${}_2$O
• Lithium and Vanadium Intercalation into Bilayer V2Se2O: Ferrimagnetic-Ferroelastic Multiferroics and Anomalous and Spin Transport
• Model Hamiltonian for Altermagnetic Topological Insulators
• Light-induced odd-parity altermagnets on dimerized lattices
• Altermagnetic Flatband-Driven Fermi Surface Geometry for Giant Tunneling Magnetoresistance
• Two-Dimensional Altermagnetic Iron Oxyhalides: Real Chern Topology and Valley-Spin-Lattice Coupling
• Symmetry Classification for Alternating Excitons in Two-Dimensional Altermagnets
• Quantum geometry and magnon Hall transport in an altermagnet
• Non-linear anomalous Edelstein response at altermagnetic interfaces
• Real Chern insulators in two-dimensional altermagnetic Fe${}_2$S${}_2$O and Fe${}_2$Se${}_2$O
• Tunable altermagnetism via inter-chain engineering in parallelassembled atomic chains
• Quantum geometry and $X$-wave magnets with $X=p,d,f,g,i$
• Josephson current signature of Floquet Majorana and topological accidental zero modes in altermagnet heterostructures
• Exploration of Altermagnetism in $\mathrm{Ru}{\mathrm{O}}_2$
• The emergence of net chirality in two-dimensional Dirac fermions system with altermagnetic mass
• Helical Fermi Arc in Altermagnetic Weyl Semimetal
• Valley-dependent electronic properties in two-dimensional altermagnetic iron-based transition metal chalcogenides
• Cavity-induced coherent magnetization and polaritons in altermagnets
• Electric and spin current vortices in altermagnets
• Quantum Lifshitz points in an altermagnetic metal
• Spin-Polarized Josephson Supercurrent in Nodeless Altermagnets
• Altermagnetism, ARPES, symmetry, non-relativistic band splitting
• Physical properties and first-principles calculations of an altermagnet candidate Cs${}_{1-\delta }$V${}_2$Te${}_2$O
• Magnetic-field-tuned randomness in inhomogeneous altermagnets
• Microscopic origin of the magnetic interactions and their experimental signatures in altermagnetic La${}_2$O${}_3$Mn${}_2$Se${}_2$
• Viscoelastic tensor and hydrodynamics of altermagnets
• Magnetic-Field and Strain Engineering of Modulated Transverse Transport in Altermagnetic Topological Materials
• Engineering subgap states in superconductors by the symmetry of altermagnetism
• Odd-Parity Magnetism in Fe-Based Superconductors
• Orientation dependent anomalous Hall and spin Hall currents at junctions of altermagnets with $p$-wave magnets
• Spin-dependent quasiparticle lifetimes in altermagnets
• $d$-Wave Polarization-Spin Locking in Two-Dimensional Altermagnets
• Altermagnetism and its induced higher-order topology on the Lieb lattice
• TbPt6Al3: A rare-earth-based g-wave altermagnet with a honeycomb structure
• Inherent momentum-dependent gap structure of altermagnetic superconductors
• Impact of strong electronic correlations on altermagnets: the case of NiS2
• Dirac edge states as signature of two-dimensional altermagnetic topological crystalline phase
• Electric-Field-Controlled Altermagnetic Transition for Neuromorphic Computing
• Incommensuration in odd-parity antiferromagnets
• Probing Hidden Symmetry and Altermagnetism with Sub-Picometer Sensitivity via Nonlinear Transport
• Spin-resolved quasiparticle interference patterns on altermagnets via non-spin-resolved scanning tunneling microscopy
• Marginal Metals and Kosterlitz-Thouless Type Phase Transition in Disordered Altermagnets
• Tuning spin currents in collinear antiferromagnets and altermagnets
• Altermagnetic Metal-Organic Frameworks
• Chemistry and physics of layered oxychalcogenides containing an anti-cuprate type square lattice
• Saturated and Anisotropic Magnetostriction in an Altermagnet
• Fermi liquid theory of $d$-wave altermagnets: demon modes and Fano-demon states
• Spin-biased quantum spin Hall effect in altermagnetic Lieb lattice
• Van-Hove singularities and competing instabilities in an altermagnetic metal
• Néel vector controlled charge and spin transport in altermagnetic junctions
• Cartesian Nodal Lines and Magnetic Kramers Weyl Nodes in Spin-Split Antiferromagnets
• Non-Hermitian higher-order topological insulators enabled by altermagnet engineering
• Higher-order topological insulators in two-dimensional antiferromagnetic and altermagnetic chromium-based group-IV chalcogenides
• Altermagnetism Induced Bogoliubov Fermi Surfaces Form Topological Superconductivity
• Altermagnetism from the viewpoint of chemistry
• Hyperspin Altermagnets
• Spontaneous emergence of altermagnetism in the single-orbital extended Hubbard model
• Superconducting States and Intertwined Orders in Metallic Altermagnets
• Quantum-impurity sensing of altermagnetic order
• Quantum anomalous Hall effect with high Chern number in two dimensional ferromagnets Ti2TeSO
• Spin-Orbit Coupling-Driven Chirality Switching of Spin Waves in Altermagnets
• Absence of magnetic order and magnetic fluctuations in RuO${}_2$
• Nonlinear opto-magnetic signature of d-wave altermagnets
• Probing multipolar order in the candidate altermagnet MnF${}_2$ through the elastocaloric effect under strain
• Unconventional Spin Valve Based on Normal Metal/Chiral Molecule/Altermagnet Junctions
• Second-order topological insulator induced by compensated altermagnetism without bulk spin splitting