Double-domed temperature-pressure phase diagram of CePd3S4

CePd3S4 exhibits interplay between ferromagnetism (FM), quadrupolar order, and the Kondo effect at low temperatures with a FM transition temperature that is much higher than the value expected from the de Gennes scaling of the heavier RPd3S4 compounds. In this work, we investigated the electrical transport and magnetic properties of CePd3S4 under pressure up through 12 GPa to better understand the interplay between electronic and magnetic phases in this material. Our findings show that the low-pressure FM state is suddenly replaced by a magnetically ordered phase that is most likely antiferromagnetic that spans from similar to 7 to similar to 11 GPa. Whereas this could be described as an example of avoided quantum criticality, given that clear changes in resistance and Hall data are detected near 6.3 GPa for all temperatures below 300 K, it is also possible that the change in ground state is a response to a pressure-induced change in structure. The lack of any discernible change in the pressure dependence of the room-temperature unit-cell parameter-volume across this whole pressure range suggests that this change in structure is either more subtle than could be detected by our measurements (i.e., development of weak wave vector) or the transition is electronic (such as a Lifshitz transition).