Critical magnetic susceptibility of gadolinium

The magnetic suspectibility of a single crystal of high-purity gadolinium has been measured in the critical region with use of ac susceptibility methods. For reduced temperatures $t\gtrsim {10}^{-3\mathrm{}}$, the data are described by a simple power law of the form $\chi =A{t}^{-\gamma }$ with an exponent $\gamma =1.22\mathrm{}\left(2\right)\mathrm{}$ and a Curie temperature $T_c=293.51\mathrm{}\left(3\right)\mathrm{}$ K. For reduced temperatures $t\lesssim {10}^{-3\mathrm{}}$, the data cannot be described by a simple power law and indicate the possibility of a crossover to different critical behavior.