Magnetic Ordering in PrB6

Abstract

We present measurements of the specific heat and resistivity $\rho$ of Pr${\mathrm{B}}_6$ at low temperatures. The extreme sharpness of the specific-heat anomaly at the antiferromagnetic ordering temperature indicates that Pr${\mathrm{B}}_6$ may undergo a first-order transition of the type predicted by Wang and Cooper. A comparison of $\frac{d\rho }{\mathrm{dT}}$ with the heat capacity in the critical region gives qualitative agreement with the theory of Fisher and Langer.