Abstract

Antiferromagnetic ordering among Gd 3+ ions in the nonsuperconducting compound TlBa 3 GdCu 2 O 7-δ occurs near 2.2-2.3 K as confirmed by magnetic and calorimetric measurements. This compound is similar in structure to that of superconducting GdBa 2 Cu 3 O 7-y , but with the Cu-O chains replaced by Tl-O planes, which also exhibits a similar magnetic transition at 2.2-2.3 K. This paper further compares the Neel temperatures and magnetic specific-heat anomalies of various Gd-containing compounds and related systems. Some common features between the compounds are discussed

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