Is CeCoSi₃ a superconductor?

We report low temperature magnetization measurements on several samples of CeCoSi3 synthesized by induction melting and the Czochralski method. We aim to investigate whether the noncentrosymmetric material CeCoSi3 is a superconductor as there are conflicting reports in the literature. Induction melted samples were generally found to display superconducting signals with up to a 12% superconducting volume fraction. However most samples grown by the Czochralski method produced no superconducting signal although the boules were generally inhomogeneous. Superconducting impurity phases could not be identified from powder x-ray diffraction studies. Further work is necessary to determine whether CeCoSi3 may be classified as another noncentrosymmetric superconductor in the same series as CeRhSi3, CeIrSi3 and CeCoGe3 and the first at ambient pressure.