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Lead-mercury-based superconductors. The 1212 cuprate Pb0.7Hg0.3Sr2+ xCa0.7Nd0.3- xCu2O7- δand the new oxycarbonate Pb0.7Hg0.3Sr4Cu2CO3O7

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
222
Identifiers
DOI: 10.1016/0921-4534(94)90109-0
Disciplines
  • Physics

Abstract

Abstract A new superconducting mercury oxycarbonate, Pb 0.7Hg 0.3Sr 4Cu 2CO 3O 7, has been synthesized. This tetragonal phase ( a=3.824 A ̊ , c=16.468 A ̊ ) consists of an intergrowth of two nonsuperconducting compounds, Sr 2CuO 2CO 3 and Pb 0.7Hg 0.3Sr 2CuO 5. It exhibits after optimization a critical temperature of 70 K, with a sharp transition and a superconducting volume fraction of 50%. Its behavior can be compared to that of thallium oxycarbonates previously isolated. This study is completed by a reinvestigation of the 1212 cuprate of the system Hg-Pb-Sr-Ca-Nd-Cu. A superconducting phase with the 1212 structure, similar to that previously obtained but with a significantly different composition, Pb 0.7Hg 0.3Sr 2+ x Ca 0.7Nd 0.3- x Cu 2 O 7, has been obtained, with a T c onset of 100 K. The behavior of the latter is compared with other lead-based 1212 cuprates.

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