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arXiv · 2601.19105

Altermagnetic spin-split Fermi surfaces in CrSb revealed by quantum oscillation measurements

Taichi Terashima·Yuya Hattori·David Graf·Takahiro Urata·Tomoki Yoshioka·Wataru Hattori·Hiroshi Ikuta·Hiroaki Ikeda
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Abstract

We report a comprehensive quantum oscillation study of the prototypical altermagnet CrSb, combining high-field magnetotransport and torque measurements with DFT + $U$ calculations including spin-orbit coupling. Multiple quantum oscillation frequencies were observed and tracked over wide angular ranges. The measured frequency branches are consistently explained by the spin-split Fermi surfaces arising from the altermagnetic electronic structure. Our determined Fermi surface reveals that bands 1 and 2 form closed pockets centered at the A point, rather than the tubular $c$-axis-open sheets or $\Gamma$-centered closed pockets proposed in previous studies. Our findings establish the Fermi-surface topology of CrSb and provide a firm basis for exploring emergent phenomena in altermagnetic materials.

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Taichi Terashima, Yuya Hattori, David Graf, Takahiro Urata, Tomoki Yoshioka, Wataru Hattori, Hiroshi Ikuta, Hiroaki Ikeda. 2026-01-27. Altermagnetic spin-split Fermi surfaces in CrSb revealed by quantum oscillation measurements. https://arxiv.org/abs/2601.19105

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