Atomic-scale STM identifies both C-type (d-wave altermagnetic) and G-type (antiferromagnetic) magnetic configurations in KV2Se2O, both generating similar spin-split electronic structures.
Atomic-scale visualization of d-wave altermagnetism
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abstract
Altermagnetism is a newly identified magnetic phase, distinct from conventional ferromagnetism and antiferromagnetism. It exhibits no net magnetization while breaking time-reversal symmetry. Although its momentum-space signatures are established, direct real-space visualization of its defining rotational-symmetry breaking remains missing. Here, using scanning tunnelling microscopy, we provide atomic-scale real-space evidence for altermagnetism in CsV2Se2O. Utilizing intrinsic spin defects as probes, we directly visualize the hallmark symmetry breaking through unidirectional electronic patterns and elliptical charging rings, both tied to the alternating spin texture. Moreover, adjacent spin-defect lines exhibit opposite spins and long-range antiferromagnetic coupling, hinting at a novel spin order. Our work moves the field from momentum-space probes to direct real-space visualization, opening a path to explore how this unconventional magnetic order couples to other quantum states.
years
2026 4verdicts
UNVERDICTED 4representative citing papers
Pressure suppresses the density-wave feature in the d-wave altermagnet candidate CsV2Se2O and induces a reproducible, field-suppressible resistive downturn below 3 K suggestive of superconductivity.
A J1-J2-J3 Heisenberg model plus DFT yields a global phase diagram for NiAs-type compounds that includes new g-wave altermagnets, f-wave OPMs, and mixed-parity states dominated by f-wave in CrSe and CrTe1-xSex.
V2O-based altermagnets enable robust spin-polarized specular Andreev reflection in superconductor junctions, detectable via nonlocal conductance in a multiterminal geometry.
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Pressure-Induced Superconducting-like Transition in the $\it d$-wave Altermagnet Candidate CsV$_2$Se$_2$O
Pressure suppresses the density-wave feature in the d-wave altermagnet candidate CsV2Se2O and induces a reproducible, field-suppressible resistive downturn below 3 K suggestive of superconductivity.
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Robust realization of spin-polarized specular Andreev reflection in V$_2$O-based altermagnets
V2O-based altermagnets enable robust spin-polarized specular Andreev reflection in superconductor junctions, detectable via nonlocal conductance in a multiterminal geometry.