Altermagnetism and Anomalous Transport in Ag${}^{2+}$ Fluorides: KAgF${}_3$ and K${}_2$AgF${}_4$

Abstract

Compounds containing Ag${}^{2+}$ ion with 4d${}^9$ configuration will cause significant Jahn-Teller distortions and orbital ordering. Such orbital order is closely related to the magnetic coupling, according to Goodenough-Kanamori Ruels. Our first-principles calculations reveal that the ground state of KAgF${}_3$ exhibits collinear A-type antiferromagnetic (A-AFM) ordering accompanied by C-type orbital ordering. In contrast, K${}_2$AgF${}_4$ adopts a collinear intralayer antiferromagnetic configuration coupled with ferromagnetic orbital ordering. The A-AFM KAgF${}_3$ presents distinct altermagnetic responses, including: (i) prominent anomalous transport effects, such as anomalous Hall conductivity (AHC), anomalous Nernst conductivity (ANC), and thermal anomalous Hall conductivity (TAHC); and (ii) strong magneto-optical responses, manifested through pronounced Kerr and Faraday effects. On the other hand, K${}_2$AgF${}_4$ behaves as a conventional collinear antiferromagnet preserving $\mathcal{P}\mathcal{T}$ symmetry, hence precluding the emergence of an anomalous Hall response.

References in corpus (33)

• Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
• Observation of the Anomalous Hall Effect in a Collinear Antiferromagnet
• Berry phase effect in anomalous thermoelectric transport
• Universal Scaling Behavior of Anomalous Hall Effect and Anomalous Nernst Effect in Itinerant Ferromagnets
• Giant momentum-dependent spin splitting in centrosymmetric low Z antiferromagnets
• Quantum transport theory of anomalous electric, thermoelectric, and thermal Hall effects in ferromagnets
• Broken Kramers' degeneracy in altermagnetic MnTe
• Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
• Spectral and Fermi surface properties from Wannier interpolation
• Bottom-up design of spin-split and reshaped electronic band structures in spin-orbit-coupling free antiferromagnets: Procedure on the basis of augmented multipoles
• Crystal Thermal Transport in Altermagnetic RuO2
• Topological Superconductivity in Two-Dimensional Altermagnetic Metals
• Ferroelectric switchable altermagnetism
• Nonmagnetic Ground State in RuO${}_2$ Revealed by Muon Spin Rotation
• Absence of altermagnetic spin splitting character in rutile oxide RuO${}_2$
• Predictable gate-field control of spin in altermagnets with spin-layer coupling
• Topological transition from nodal to nodeless Zeeman splitting in altermagnets
• Spin-order dependent anomalous Hall effect and magneto-optical effect in noncollinear antiferromagnets Mn${}_{3}X$N ($X$ = Ga, Zn, Ag, and Ni)
• Electrically Controllable Crystal Chirality Magneto-Optical Effects in Collinear Antiferromagnets
• Spontaneous Formation of Altermagnetism from Orbital Ordering
• Realizing Altermagnetism in Fermi-Hubbard Models with Ultracold Atoms
• Two-Dimensional Ferroelectric Altermagnets: From Model to Material Realization
• Altermagnetism and magnetic groups with pseudoscalar electron spin
• AI-accelerated Discovery of Altermagnetic Materials
• Stacking-dependent ferroicity of reversed bilayer: altermagnetism or ferroelectricity
• Tunable band topology and optical conductivity in altermagnets
• Magneto-optical Kerr effect and magnetoelasticity in weak ferromagnetic RuF${}_4$ monolayer
• Magneto-optic and transverse transport properties of non-collinear antiferromagnets
• Anomalous Hall Effect in Type IV 2D Collinear Magnets
• Kerr, Faraday, and Magnetoelectric Effects in MnBi${}_2$Te${}_4$ Thin Films
• Low temperature magnetism of KAgF3
• Rearrangement of orbitals in KAgF3 due to Kugel-Khomskii mechanism: a Neutron diffraction and Density Functional Theory study
• Emerging new phases in correlated Mott insulator Ca2RuO4