Zero-field chiral phonons with g-wave phonon angular momentum emerge in altermagnetic CrSb from relativistic magnon-phonon hybridization, enabling anomalous spin and PAM Nernst effects.
Coherent high-velocity chiral magnons in the metallic altermagnet CrSb
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abstract
We report the collective magnetism of the metallic altermagnet CrSb. Magnetic susceptibility and polarized neutron diffraction measurements show that CrSb is a perfectly compensated Ising altermagnet below a N\'eel temperature of $T_N = 733(4)$ K. Inelastic neutron scattering experiments reveal coherent and highly-dispersive antiferromagnetic spin waves with large group velocities of 61(2) km s$^{-1}$ and 58(2) km s$^{-1}$ along the in-plane and out-of-plane directions, respectively. The observed magnon dispersions along high-symmetry directions of the Brillouin zone are well described by a minimal Heisenberg model up to third nearest neighbors of alternating antiferromagnetic and ferromagnetic character, $J_1 = 23(4)$ meV, $J_2 = -5.4(8)$ meV, $J_3 = 5.2(8)$ meV, and an Ising single-ion anisotropy term $D = 0.15(4)$ meV. We observe clear momentum space signatures of chiral spin splitting along the low-symmetry $\Gamma$-$L$ direction, characteristic of higher-order altermagnetic exchange interactions, the first such observation in a metallic altermagnet. These findings identify CrSb as a singular material: a metallic altermagnet in which coherent spin-split magnons persist well above room temperature, providing a compelling platform for spintronic applications.
years
2026 5representative citing papers
RIXS circular dichroism with d-wave symmetry in La2O3Mn2Se2 provides evidence for d-wave altermagnetism independent of magnon splitting.
PT-symmetric antiferromagnets with hidden dipoles allow electric fields to induce up to 20 meV chiral magnon splitting in Cr2CCl2 and Cr2CBr2, enabling reversible switching of magnon spin currents.
Anisotropic surface spin waves with chirality-dependent positions and split constant-frequency contours are proposed as a measurable signature for A-type altermagnets.
The proposed spin–orbit band splitting for CrSb (Eq. 10) is not invariant under the paper's own magnetic group (Eq. 9), and the abstract's toroid-altermagnet result is absent from the text.
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Symmetry-Enforced Chiral Phonons in Altermagnets via Magnon-Phonon Coupling
Zero-field chiral phonons with g-wave phonon angular momentum emerge in altermagnetic CrSb from relativistic magnon-phonon hybridization, enabling anomalous spin and PAM Nernst effects.
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$d$-wave altermagnetism revealed by resonant inelastic X-ray scattering
RIXS circular dichroism with d-wave symmetry in La2O3Mn2Se2 provides evidence for d-wave altermagnetism independent of magnon splitting.
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Electric-Switchable Chiral Magnons in PT-Symmetric Antiferromagnets
PT-symmetric antiferromagnets with hidden dipoles allow electric fields to induce up to 20 meV chiral magnon splitting in Cr2CCl2 and Cr2CBr2, enabling reversible switching of magnon spin currents.
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Anisotropic Surface Spin Waves as Signature of A-type Altermagnets
Anisotropic surface spin waves with chirality-dependent positions and split constant-frequency contours are proposed as a measurable signature for A-type altermagnets.
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Band splitting in the altermagnet CrSb
The proposed spin–orbit band splitting for CrSb (Eq. 10) is not invariant under the paper's own magnetic group (Eq. 9), and the abstract's toroid-altermagnet result is absent from the text.