AbstractIn order to investigate the low‐temperature electronic properties of the heavy‐fermion metal CeNi2Ge2, single crystals were grown using the floating zone technique. Previous investigations on polycrystals of CeNi2Ge2 have revealed that the low‐temperature properties, i.e., non‐Fermi liquid (NFL) behavior and incipient superconductivity, are strongly sample dependent, possibly due to a slight variation of the Ni and Ge content. We prepared polycrystalline feed rods of slightly off‐stoichiometric composition by induction or arc‐melting methods and grew single crystals using a four‐mirror optical furnace under high‐purity argon atmosphere. As a result, large single crystals of few centimeter size have been obtained. Annealed pieces were investigated by measurements of the temperature dependence of the electrical resistivity ρ(T). A clear correlation between the starting composition and the obtained resistivity ratio (RR2K) was found with the highest ratio for a nominal starting composition of Ce0.98Ni2.025Ge1.975 (${\rm RR}_{2{\rm K}} = 29$). The temperature dependence of the electrical resistivity is similar as reported previously and displays NFL behavior below 1 K.