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We found that the ZrCuSiAs-type crystal CeNi0.8Bi2 with a layered structurecomposed of alternate stacking of [CeNixBi(1)]{\delta}+ and Bi(2){\delta}-exhibits a superconductive transition at ~4 K, which was confirmed by zeroresistance and the Meissner effect (shielding volume faction ~100% at 2 K).Heat capacity measurements revealed that the electron mass at the normal state(>5 K) is heavy ({\gamma} = 0.4 J mol-1 K-2) and a peak responsible for theanti-ferromagnetic ordering of Ce3+ 4f1 at ~5 K. These results indicate thatthere are two types of carriers with notable different masses, i.e., a lightelectron responsible for superconductivity and a heavy electron interactingwith the Ce 4f electron. This observation suggests that 6p electrons of Bi(2)forming the square net and electrons in CeNixBi(1) layers primarily correspondto light and heavy electrons, respectively.

Coexistence of light and heavy carriers associated with superconductivity and anti-ferromagnetism in CeNi0.8Bi2 with a Bi square net