Abstract
Shubnikov-de Haas (SdH) and Hall-effect measurements of CeBiPt and LaBiPt reveal the presence of very small Fermi surfaces with hole-like charge carriers for both semimetals. Reasonable agreement with band structure calculations is achieved when taking spin-orbit coupling into account and assuming localized Ce 4f electrons. For CeBiPt, we observe a strong temperature dependence of the SdH frequency, i.e., an increase from ∼ 35 T at 10 K to ∼ 60 T at 0.4 K, indicating a possible hybridization of the f electrons.