中国科学院北京凝聚态物理国家实验室物理研究所钱天团队研究了一种金属室温d波交变磁体。这一研究成果于2025年3月18日发表在《自然—物理学》杂志上。
交变磁性是最近发现的一种非常规磁相，其特征是零净磁化材料中的时间反演对称性破坏和自旋分裂带结构。最近，在半导体MnTe和MnTe2中观察到自旋极化带结构和消失的净磁化，证实了这种非常规的磁序。金属交变磁体为探索与低能准粒子激发相关的物理现象和在自旋电子学中的应用提供了优势，因为金属的有限电导率允许通过电场直接操纵自旋电流。m
研究组证明KV2Se2O是一种具有d波自旋动量锁定的金属室温交变磁体。该实验探测了这种化合物的磁性和电子结构，揭示了一个高度各向异性的自旋极化费米表面，并在交变磁相中出现了自旋密度波序。这些特征表明，KV2Se2O可能是高性能自旋电子器件和研究与非常规磁性耦合的多体效应的有用平台。
附：英文原文
Title: A metallic room-temperature d-wave altermagnet
Author: Jiang, Bei, Hu, Mingzhe, Bai, Jianli, Song, Ziyin, Mu, Chao, Qu, Gexing, Li, Wan, Zhu, Wenliang, Pi, Hanqi, Wei, Zhongxu, Sun, Yu-Jie, Huang, Yaobo, Zheng, Xiquan, Peng, Yingying, He, Lunhua, Li, Shiliang, Luo, Jianlin, Li, Zheng, Chen, Genfu, Li, Hang, Weng, Hongming, Qian, Tian
Issue&Volume: 2025-03-18
Abstract: Altermagnetism is a recently discovered unconventional magnetic phase that is characterized by time-reversal symmetry breaking and spin-split band structures in materials with zero net magnetization. Recently, spin-polarized band structures and a vanishing net magnetization were observed in semiconductors MnTe and MnTe2, confirming this unconventional magnetic order. Metallic altermagnets offer advantages for exploring physical phenomena related to low-energy quasiparticle excitations and for applications in spintronics because the finite electrical conductivity of metals allows direct manipulation of the spin current through the electric field. We demonstrate that KV2Se2O is a metallic room-temperature altermagnet with d-wave spin-momentum locking. Our experiments probe the magnetic and electronic structures of this compound and reveal a highly anisotropic spin-polarized Fermi surface and the emergence of a spin-density-wave order in the altermagnetic phase. These characteristics suggest that KV2Se2O could be a helpful platform for high-performance spintronic devices and for studying many-body effects coupled with unconventional magnetism.
DOI: 10.1038/s41567-025-02822-y
Source: https://www.nature.com/articles/s41567-025-02822-y