Regmi Resham Babu, Bhandari Hari, Thapa Bishal, Hao Yiqing, Sharma Nileema, McKenzie James, Chen Xinglong, Nayak Abhijeet, El Gazzah Mohamed, Márkus Bence G, Forró László, Liu Xiaolong, Cao Huibo, Mitchell J F, Mazin Igor I, Ghimire Nirmal J
Department of Physics and Astronomy, University of Notre Dame, Notre Dame, IN, USA.
Stavropoulos Center for Complex Quantum Matter, University of Notre Dame, Notre Dame, IN, USA.
Nat Commun. 2025 May 13;16(1):4399. doi: 10.1038/s41467-025-58642-4.
Altermagnets (AMs) are a new class of magnetic materials that combine the beneficial spintronics properties of ferromagnets and antiferromagnets, garnering significant attention recently. Here, we have identified altermagnetism in a layered intercalated transition metal diselenide, CoNbSe, which crystallizes with an ordered sublattice of intercalated Co atoms between NbSe layers. Single crystals are synthesized, and the structural characterizations are performed using single crystal diffraction and scanning tunneling microscopy. Magnetic measurements reveal easy-axis antiferromagnetism below 168 K. Density functional theory (DFT) calculations indicate that A-type antiferromagnetic ordering with easy-axis spin direction is the ground state, which is verified through single crystal neutron diffraction experiments. Electronic band structure calculations in this magnetic state display spin-split bands, confirming altermagnetism in this compound. The layered structure of CoNbSe presents a promising platform for testing various predicted properties associated with altermagnetism.
交替磁体（AMs）是一类新型磁性材料，它结合了铁磁体和反铁磁体有益的自旋电子学特性，最近受到了广泛关注。在此，我们在层状插层过渡金属二硒化物CoNbSe中发现了交替磁性，该化合物在NbSe层之间形成了插层Co原子的有序亚晶格。我们合成了单晶，并使用单晶衍射和扫描隧道显微镜进行了结构表征。磁性测量表明，在168 K以下呈现易轴反铁磁性。密度泛函理论（DFT）计算表明，具有易轴自旋方向的A型反铁磁有序是基态，这通过单晶中子衍射实验得到了验证。该磁性状态下的电子能带结构计算显示出自旋分裂能带，证实了该化合物中的交替磁性。CoNbSe的层状结构为测试与交替磁性相关的各种预测特性提供了一个有前景的平台。
