Quantum oscillations in the centrosymmetric skyrmion-hosting magnet GdRu2Si2

We have performed magnetic torque and resistivity measurements on the 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 an ab initio calculation. The de Haas-van Alphen oscillation is also observed in the double -Q phase with a frequency different from 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.

Automated summary

We have conducted magnetic torque and resistivity measurements on the centrosymmetric skyrmion host GdRu2Si2. Both de Haas-van Alphen and Shubnikov-de Haas oscillations were observed in the forced ferromagnetic phase. The angular dependence of the quantum oscillation frequencies can be explained by an ab initio calculation. The presence of a different de Haas-van Alphen oscillation frequency in the double-Q phase suggests a Fermi surface reconstruction due to coupling between localized spins and conduction electrons. Based on these experimental findings, the magnetic interactions in this system are discussed.