Pressure-induced ferromagnetic to antiferromagnetic phase transition in Ce2Ni5C3

We have studied an effect of pressure on the ferromagnetism of Ce2Ni5C3 by ac susceptibility using a newly developed Palm cubic anvil cell up to 5.2 GPa. The ferromagnetic transition temperature of 2.3 K at ambient pressure is suppressed to zero at a critical pressure P∼3.8GPa. Instead, another magnetic phase appears above this pressure. This new magnetic phase is considered to be antiferromagnetic from the result of the magnetic field dependence of the ac susceptibility.