“…A few years ago Ce 3 Cu 3 Sb 4 was described as a ferromagnetic semiconductor [1,2] with a Curie temperature T trs of ≈10 K. Recently, further investigations on this material concentrated on the estimation of the performance in thermoelectric applications [3,4]. The ordered state of Ce 3 Cu 3 Sb 4 at low temperature, however, which in all previous investigations showed a spontaneous magnetic moment below T trs , remained a matter of debate [5,6]. Since the resistivity ρ(T ) showed a maximum at a certain temperature T max , which varied in the different studies and which did not coincide with T trs , and above which activated conduction was found, Ce 3 Cu 3 Sb 4 was classified as a degenerate p-type semiconductor [2,3].…”