de Haas-van Alphen oscillations in (La,Ce)TiGe₃

CeTiGe₃ is one of the few Kondo-lattice compounds which order ferromagnetically (T_C ≈ 14 K); LaTiGe₃ may be used as its nonmagnetic reference, since both compounds crystallize in the same hexagonal perovskite structure [1, 2]. We report on angular-resolved de Haas-van Alphen oscillations in single crystals of CeTiGe₃, LaTiGe₃, and Ce_0.1La_0.9TiGe₃ grown from Ge flux, measured in magnetic fields up to 13 T in a cantilever-type torque magnetometer. We found several dHvA frequencies, ranging in CeTiGe₃ from 100 to 530 T and with effective masses around 0.7 m₀, featuring a comparably weak angular dependence. Further, we give an interpretation of our results on the basis of DFT calculations of the electronic band structure of CeTiGe₃ and LaTiGe₃.