Abstract
The technique of temperature modulation of the AC magnetic susceptibility is used for the first time to examine the critical region above a ferromagnetic-paramagnetic transition. The temperature modulation and low-field susceptibility data indicate a well defined critical exponent behaviour chi = chi 0 epsilon - gamma , where epsilon =(T-Tc)/Tc for polycrystalline Gd, and lead to the critical parameters gamma =1.24+or-0.03 and chi 0=0.001 for 9.9*10-3<or= epsilon <or=3.7*10-2.
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