Anomalous temperature dependence of magnetic quantum oscillations in   CeBiPt
  Shubnikov--de Haas (SdH) and Hall-effect measurements of CeBiPt and LaBiPt reveal the presence of simple and very small Fermi surfaces with hole-like charge carriers for both semimetals. In the magnetic material, CeBiPt, we observe a strong temperature dependence of the SdH frequency. This highly unusual effect might be connected with an internal exchange field within the material and a strongly spin-dependent scattering of the charge carriers. 
G. Goll, J. Hagel, H. v. Loehneysen, T. Pietrus, S. Wanka, J.   Wosnitza, T. Yoshino, T. Takabatake