Figure 2.

(a) Symmetrized MR in needle A (upper) and B (lower) at four different θ angles. The inset figure of lower panel is an enlarged view, showing a small negative MR at θ = 0°. (b,c) Plot the pure oscillatory component in MR versus 1/μ₀H for needle A and B, respectively, at θ = 90° and various temperatures ranging from 5 to 80 K. The upper and lower insets are the corresponding effective masses fitting using Lifshitz-Kosevich formula and FFT spectra. Both needle A and B exhibit beating patterns in SdH oscillations with multiple closely-spaced peaks in the FFT spectra at θ = 90°.