Quantum oscillations and a nontrivial Berry phase in the noncentrosymmetric topological superconductor candidate BiPd
We report the measurements of de Haas-van Alphen (dHvA) oscillations in the noncentrosymmetric superconductor BiPd. Several pieces of a complex multisheet Fermi surface are identified, including a small pocket (α∼40 T) which is three dimensional and anisotropic. From the temperature dependence of the amplitude of the oscillations, the cyclotron effective mass is (0.18±0.02) me. Further analysis revealed a nontrivial π-Berry phase is associated with the 40 T pocket, which strongly supports the presence of topological states in bulk BiPd.
Publication Source (Journal or Book title)
Physical Review B
Khan, M., Graf, D., Vekhter, I., Browne, D., Ditusa, J., Phelan, W., & Young, D. (2019). Quantum oscillations and a nontrivial Berry phase in the noncentrosymmetric topological superconductor candidate BiPd. Physical Review B, 99 (2) https://doi.org/10.1103/PhysRevB.99.020507