金属反磁性材料 CrSb 中的相干高速手性磁激元
摘要
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 K. Inelastic neutron scattering experiments reveal coherent and highly-dispersive antiferromagnetic spin waves with large group velocities of 61(2) km s and 58(2) km s 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, meV, meV, meV, and an Ising single-ion anisotropy term meV. We observe clear momentum space signatures of chiral spin splitting along the low-symmetry - 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.
引用
@article{arxiv.2511.16085,
title = {Channel-selective frequency up-conversion for frequency-multiplexed quantum network},
author = {Shoichi Murakami and Shunsuke Hiraoka and Toshiki Kobayashi and Takashi Yamamoto and Rikizo Ikuta},
journal= {arXiv preprint arXiv:2511.16085},
year = {2026}
}