Topological Properties of Superconducting PdTe

PdTe is a superconductor with T_c ~ 4.5 K. We have investigated its normal-state electronic properties via both first principles calculations and magnetic torque measurements by applying magnetic field up to 35 Tesla. Detailed analysis of the de-Haas van Alphen (dHvA) oscillations allows us to identify four frequencies: F_α = 64 T, F_β = 658 T, F_γ = 1155 T, and F_η = 1867 T. Using the Lifshitz-Kosevich equation to fit the experimental data, the effective masses are obtained with m*_α = 0.305m₀, m*_β = 0.288m₀, m*_γ = 0.415m₀, and m*_η = 0.451m₀ (m₀ is the free electron mass). By constructing the Landau fan diagram for each band, we extract the Berry phase, which is non-trivial for the α and γ bands. These experimental findings are consistent with the calculated results. This suggests that PdTe is a topological superconductor.