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Structural and physical properties of the new superconductor Hg0.5Pb0.5Sr4-xBaxCu2(CO3)O7-δ

✍ Scribed by M. Huvé; G. Van Tendeloo; M. Hervieu; A. Maignan; B. Raveau

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 626 KB
Volume: 231
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(94)90138-4

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✦ Synopsis

A new series of superconducting compounds Hgi _,~'b~Sr,_xBaxCu2 (CO3)O7 has been synthesized. The critical temperature reaches a maximum of 68 K for x=2; for the x= 1 and y=0.5 compound, which is mainly studied here, the optimized Tc is around 55 K. All Pb containing compounds exhibit a modulation along the [ 110] direction, to be attributed to an ordering between (Pb-Hg)O6 and carbonate groups. This ordering is highly variable depending, among others, on the local CO3 content and gives rise to different commensurate and incommensurate superstructures.

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