Fig. 2.
SdH oscillations of sample 1 (EF > Ec). (A and B) Magnetoresistance (A) and Hall effect (B) of sample 1 under various pressures. Clear SdH oscillations have been observed at T = 2K. (C) Oscillating components of the resistance calculated by subtracting the polynomial background from A. (D) Landau index plot of sample 1. We chose the minimum of the resistance as an integer index. (E) Pressure dependence of the cross-sectional area of Fermi surface estimated from the periods of oscillations. SF shows the anomalous jump around P = 0.5 GPa and upturn at P = 2 GPa. (F) Pressure evolution of the calculated 3D Fermi surface for the sample with EF = 1 meV at ambient pressure. From the left figure, P = 0 GPa, P = 0.6 GPa, P = 1.22 GPa, and P = 2.16 GPa, respectively.