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Three-dimensional mapping of the altermagnetic spin splitting in CrSb
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Three-dimensional mapping of the altermagnetic spin splitting in CrSb
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Journal Article
Three-dimensional mapping of the altermagnetic spin splitting in CrSb
2025
Overview
Altermagnetism, a kind of collinear magnetism that is characterized by a momentum-dependent band and spin splitting without net magnetization, has recently attracted considerable interest. Finding altermagnetic materials with large splitting near the Fermi level necessarily requires three-dimensional
k
-space mapping. While this is crucial for spintronic applications and emergent phenomena, it remains challenging. Here, using synchrotron-based angle-resolved photoemission spectroscopy (ARPES), spin-resolved ARPES and model calculations, we uncover a large altermagnetic splitting, up to ~1.0 eV, near the Fermi level in CrSb. We verify its bulk-type
g
-wave altermagnetism through systematic three-dimensional
k
-space mapping, which unambiguously reveals the altermagnetic symmetry and associated nodal planes. Spin-resolved ARPES measurements further verify the spin polarizations of the split bands near Fermi level. Tight-binding model analysis indicates that the large altermagnetic splitting arises from strong third-nearest-neighbor hopping mediated by Sb ions. The large band/spin splitting near Fermi level in metallic CrSb, together with its high
T
N
(up to 705 K) and simple spin configuration, paves the way for exploring emergent phenomena and spintronic applications based on altermagnets.
Altermagnets combine the rapid dynamics and zero magnetization of collinear antiferromagnets with the spin-splitting of ferromagnets, making them an idea platform for both fundamental research and applications. Here, Yang, Li and coauthors map the large altermagnetic spin-splitting in CrSb located near the Fermi level.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
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