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

TL;DR

This study combines high-field magnetotransport measurements and first-principles calculations to map the Fermi surface of altermagnetic CrSb, confirming its predicted electronic structure and emphasizing the role of strong magnetic fields in studying unconventional materials.

Contribution

It provides the first detailed experimental mapping of CrSb's Fermi surface, validating theoretical predictions and demonstrating the effectiveness of high magnetic fields in such studies.

Findings

Fermi surface matches density-functional-theory predictions

Magnetic quantum oscillations depend on temperature and field orientation

High magnetic fields are crucial for accurate Fermi surface mapping

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. 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.