Robust altermagnetic band splitting and non-topological origin of magneto-transport in CrSb thin films

Résumé fourni par la source

Altermagnetic materials combine zero net magnetization with large spin splitting, offering new material platforms for spintronics. As the leading altermagnetic candidate, CrSb has been predicted to be a Weyl semimetal but lacks experimental evidence. Here, we report the controllable fabrication of high-quality CrSb (000 l ) thin films, leveraging optimized growth parameters and a novel Cr 2 SbTe buffer layer. Angle-resolved photoemission spectroscopy (ARPES) measurements provide definitive evidence of g -wave altermagnetic order, revealing a large band splitting of 0.54 eV near E F . The surface and altermagnetic band splitting are remarkably robust in CrSb thin films, as demonstrated from aspects of long-term storage, protective passivation layer strategy, and film thickness dependence. Moreover, magneto-transport measurements find no hallmark signatures of Weyl fermions, including the absence of negative chiral magnetoresistance and the specific scaling behavior of the planar Hall effect (PHE). This work establishes high-quality CrSb thin films as a robust platform for exploring altermagnetic phenomena and spintronic devices.

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