Metallic $p$-wave magnet with commensurate spin helix

Abstract

Antiferromagnetic states with spin-split electronic structure give rise to novel spintronic, magnonic, and electronic phenomena despite (near-) zero net magnetization. The simplest odd-parity spin splitting - $p$-wave - was originally proposed to emerge from a collective instability in interacting electron systems. Recent theory identifies a distinct route to realise $p$-wave spin-split electronic bands without strong correlations, termed $p$-wave magnetism. Here we demonstrate an experimental realisation of a metallic $p$-wave magnet. The odd-parity spin splitting of delocalised conduction electrons arises from their coupling to an antiferromagnetic texture of localised magnetic moments: a coplanar spin helix whose magnetic period is an even multiple of the chemical unit cell, as revealed by X-ray scattering experiments. This texture breaks space inversion symmetry but preserves time-reversal ($T$) symmetry up to a half-unit-cell translation - thereby fulfilling the symmetry conditions for $p$-wave magnetism. Consistent with theoretical predictions, our $p$-wave magnet exhibits a characteristic anisotropy in the electronic conductivity. Relativistic spin-orbit coupling and a tiny spontaneous net magnetization further break $T$ symmetry, resulting in a giant anomalous Hall effect (AHE, ${\sigma }_{xy}>600$S/cm, Hall angle $>3\%$), for an antiferromagnet. Our model calculations show that the spin nodal planes found in the electronic structure of $p$-wave magnets are readily gapped by a small perturbation to induce the AHE.

24 pages, 4 figures

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Cited by in corpus (18)

• Floquet engineering spin triplet states in unconventional magnets
• Light-induced Odd-parity Magnetism in Conventional Collinear Antiferromagnets
• Quantum geometry and $X$-wave magnets with $X=p,d,f,g,i$
• Almost half-quantized planar Hall effects in $X$-wave magnets with $X=p,d,f,g,i$
• Quantum Geometric Origin of the Intrinsic Nonlinear Hall Effect
• Altermagnetism, ARPES, symmetry, non-relativistic band splitting
• Orientation dependent anomalous Hall and spin Hall currents at junctions of altermagnets with $p$-wave magnets
• Incommensuration in odd-parity antiferromagnets
• Odd-Parity Magnetism in Fe-Based Superconductors
• Tunneling magnetoresistance in a junction made of $X$-wave magnets with $X=p,d,f,g,i$
• Quantum spin models of commensurate $p$-wave magnets
• Analysis of Spin Current Generation by Elastic Waves in $f$-wave Altermagnets
• Measuring the Hall effect in hysteretic materials
• Hyperspin Altermagnets
• Fourth-order and six-order nonlinear spin current rectifier in three-dimensional $h$-wave and $j$-wave odd-parity magnet
• Collinear ferromagnetism with reduced moment length in kagome magnet Nd3Ru4Al12
• Altermagnetism from the viewpoint of chemistry
• Time reversal reserved spin valve and spin transistor based on unconventional $p$-wave magnets