Fig. 2: Shubnikov-de Hass oscillations of SrAs3.
From: Quantum transport evidence of isolated topological nodal-line fermions
a, b Magnetoresistance (MR) Δρ(H)/ρ(0) of SrAs3 with different magnetic field orientations in the (ky,kz) plane (a, S1) and in the (kx,ky) plane (b, S2). The second derivative of ρ(H) with respect to 1/H at H∥kz is also shown in a. The overlaid dashed gray curve corresponds to the coexisting SdH oscillations with a lower frequency. The black arrows indicate peaks and deeps of the higher-frequency oscillations. The polar (θ) and azimuthal (ϕ) angles are defined with respect to the torus-shaped Fermi surface as shown in the insets. c SdH oscillations (Δρosc./ρ(0)) at various magnetic field orientations in the planes of (kx,ky), (ky,kz) and (kx,kz) for S1. The inset shows torus-shaped Fermi surface of SrAs3 with the poloidal orbit (α) and the inner (β) and outer (δ) toroidal orbits. d, e, f Fast Fourier transform (FFT) amplitudes for α orbit (d), and β orbit (d) and δ orbit (f), taken at various temperatures for H∥ky (d) and H∥kz (e, f). The insets show the temperature-dependent FFT amplitudes, together with the fits (red lines) to the Lifshitz–Kosevich equation. In e, the FFT amplitude of the δ orbit, F > 100 T, is magnified for comparison.
