Quantum oscillations in a centrosymmetric skyrmion-hosting magnet GdRu2Si2

Authors :: Matsuyama, N.
Nomura, T.
Imajo, S.
Nomoto, T.
Arita, R.
Sudo, K.
Kimata, M.
Khanh, N. D.
Takagi, R.
Tokura, Y.
Seki, S.
Kindo, K.
Kohama, Y.
Publication Year :: 2022
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.<br />Comment: 11 pages, 8 figures