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Anomalous Pr ordering in the new TlBa2PrCu2O7−δcompound

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
202
Identifiers
DOI: 10.1016/0921-4534(92)90301-r
Disciplines
  • Physics

Abstract

Abstract Magnetic measurements on the new tetragonal Tl(1212) compound TlBa 2PrCu 2O 7−δ( a = 3.910 A ̊ and c = 12.53 A ̊ ) reveal an anomalously high antiferromagnetic Néel temperature T N≅8 K. This transition temperature is higher than T N =2.2 K for isostructural TlBa 2GdCu 2O 7−δ. Corroborative evidence comes from calorimetric studies, in which a magnetic entropy was obtained Δ S≅0.5 Rln 2 between 2 and 10 K, as well as a sizeable linear term in specific heat comparable to those found in heavy-fermion systems. Through structural consideration, these observations can not only be correlated to the almost identical but still puzzling features of PrBa 2Cu 3O 7− y , but also remove some ambiguity in the interpretation of earlier results.

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