Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
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Fermi surfaces of the half heusler compounds Ce1-xLaxBiPtBianchi, A. D.; Wosnitza, J.; Kozlova, N.; Freudenberger, J.; Schultz, L.; Opahle, I.; Elgazzar, S.; Richter, M.; Goll, G.; von Löhneysen, H.; Yoshino, T.; Takabatake, T.
We report on the Fermi surface in the correlated half-Heusler compounds Ce1-xLaxBiPt. In CeBiPt, as well as in Ce0.95La0.05BiPt, we find a temperature-dependent Fermi-surface topology. In addition, we observe a field-induced change of the electronic band structure as discovered by electrical-transport measurements in pulsed magnetic fields. For magnetic fields above about 25 T, the charge-carrier concentration determined from Hall-effect measurements increases nearly 30%, whereas the Shubnikovde Haas (SdH) signal disappears at the same field . In the non-4f compound LaBiPt the Fermi surface remains unaffected, suggesting that these features are intimately related to the Ce 4f electrons. Electronic band-structure calculations point to a 4f-polarization-induced change of the Fermi-surface topology.
International Conference on Magnetism (ICM), 20.-25.08.2006, Kyoto, Japan