Quantum oscillations and a non-trivial Berry phase in the noncentrosymmetric superconductor BiPd
Published 2017-07-14Version 1
We report the measurements of the de Haas-van Alphen (dHvA) oscillations in the noncentrosymmetric superconductor BiPd. Several pieces of a complex multi-sheet Fermi surface have been identified. Among those, a 40 T pocket was found to be three dimensional and anisotropic in nature. From the temperature dependence of the amplitude of the oscillations, the cyclotron effective mass is ($0.18$ $\pm$ 0.1) $m_e$. Further analysis showed a non-trivial $\pi$-Berry phase is associated with the 40 T pocket, which strongly supports the presence of topological states in the interior of BiPd.