Crystal and magnetic properties of GdTSn compounds (T = Ag, Au)

The results of structure, ac and dc susceptibilities, and 119Sn Mössbauer studies of GdAgSn and GdAuSn compounds are presented. It was found that these compounds order anti-ferromagnetically at T N = 34.3(2) K, and T n = 22.9(2) K, respectively. Additionally a second transition at T f = 15.3(2) K was discovered for both intermetallics. The nature of this second transition is discussed and strong experimental arguments supporting the spin-glass origin and reentrant antiferromagnetic character of the compounds under study are given.