Possible coexistence of superconductivity and magnetism in intermetallic NiBi3

► NiBi3 intermetallic alloys were prepared by solid state method. ► Superconductivity and magnetism presents coexistence. ► At low temperatures below the superconducting temperature an anomalous behavior was observed in M-H measurements. ► This anomalous behavior is the most clear indication of coexistence between superconductivity and magnetism. ► NiBi3 is magnetic above 800 K.