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Fermi surface studies of altermagnetic CrSb from Shubnikov–de Haas oscillations

Sajal Naduvile Thadathil1,2, Beat Valentin Schwarze1, Jaafar Ansari3, Tommy Kotte1, Sven Luther1, Marc Uhlarz1, Freya Husstedt1,2, Rafael Gonzalez-Hernandez4, Libor Šmejkal3,5,6 et al.

Thanassis Speliotis7, Markéta Žáčková8, Jiří Pospíšil8, Christoph Müller6,8, Dominik Kriegner6, Helena Reichlová6, Jochen Wosnitza1,2, and Toni Helm1,*

  • *Contact author: t.helm@hzdr.de
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Phys. Rev. B 114, 185104 – Published 3 September, 2026

DOI: https://doi.org/10.1103/j77q-p4ch

Abstract

Within the family of altermagnets, CrSb is a metallic, collinearly ordered material that exhibits particularly strong symmetry-induced spin splitting in its band structure. In this study, we combine electrical magnetotransport measurements up to 68 T on microfabricated single-crystalline CrSb with first-principles calculations to investigate its Fermi surface. Notably, we study the temperature and field-orientation dependence of magnetic quantum oscillations observed in the magnetoresistance. The observed frequency spectrum agrees well with results from density functional theory calculations that take spin-orbit coupling into account, without invoking significant ad hoc band shifts. Our results confirm the predicted electronic band structure of altermagnetic CrSb and highlight the importance of high magnetic fields for accurately mapping the Fermi surfaces of unconventional emergent materials.

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Phys. Rev. B 114, 185104– Published 3 September, 2026
  • Received 2 March 2026
  • Revised 18 June 2026
  • Accepted 27 July 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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