Quantum oscillations in a centrosymmetric skyrmion-hosting magnet GdRu2Si2

TL;DR

This study investigates quantum oscillations in the skyrmion-hosting magnet GdRu2Si2, revealing Fermi surface reconstruction and providing insights into the magnetic interactions responsible for skyrmion formation.

Contribution

It presents experimental evidence of quantum oscillations in GdRu2Si2 and links these to Fermi surface changes, advancing understanding of magnetic interactions in skyrmion-hosting materials.

Findings

Observation of de Haas-van Alphen and Shubnikov-de Haas oscillations

Fermi surface reconstruction in different magnetic phases

Angular dependence matching ab-initio calculations

Abstract

We have performed magnetic torque and resistivity measurements on a centrosymmetric skyrmion-host GdRu2Si2, in which the dominant magnetic interaction leading to skyrmion formation is under debate. We observe both the de Haas-van Alphen and Shubnikov-de Haas oscillations in the forced ferromagnetic phase. The angular dependence of the quantum oscillation frequencies can be reproduced by the ab-initio calculation. The de Haas-van Alphen oscillation is also observed in the double-Q phase with a different frequency to that in the forced ferromagnetic phase, indicating a Fermi surface reconstruction due to the coupling between localized spins and conduction electrons. Based on these experimental findings, the magnetic interactions in this system are discussed.