The high-temperature (14-17K) low-magnetic field (0-0.8 T) region of the phase diagram of the anomalous antiferromagnet CeSb has been reinvestigated by neutron diffraction in an attempt to locate a possible tricritical point. Previous neutron diffraction studies indicated that a tricritical point might exist in the magnetic phase diagram of CeSb at 16K for a field of approximately 0.3 T. The present study concludes that the transitions from the paramagnetic to the magnetically ordered states are of first order for fields below 0.8 T. Within the experimental accuracy no change has been observed in the first order jump of the ordered moment at Tc.
Lebech, B., Clausen, K. N., & Vogt, O. (1980). First-Order Transitions and the Magnetic Phase Diagram of CeSb. Journal of Physics C: Solid State Physics, 13(9), 1725-1733. https://doi.org/10.1088/0022-3719/13/9/018