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 t10^-3, the data are described by a simple power law of the form χ=At^-γ with an exponent γ=1.22(2) and a Curie temperature Tc=293.51(3) K. For reduced temperatures t10^-3, the data cannot be described by a simple power law and indicate the possibility of a crossover to different critical behavior.