Title
Lead-mercury-based superconductors - the 1212-cuprate <tex>$Pb_{0.7}Hg_{0.3}Sr_{2+x}Ca_{0.7}Nd_{0.3-x}Cu_{2}O_{7-\delta}$</tex> and the new oxycarbonate <tex>$Pb_{0.7}Hg_{0.3}Sr_{4}Cu_{2}CO_{3}O_{7}$</tex> Lead-mercury-based superconductors - the 1212-cuprate <tex>$Pb_{0.7}Hg_{0.3}Sr_{2+x}Ca_{0.7}Nd_{0.3-x}Cu_{2}O_{7-\delta}$</tex> and the new oxycarbonate <tex>$Pb_{0.7}Hg_{0.3}Sr_{4}Cu_{2}CO_{3}O_{7}$</tex>
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Source (journal)
Physica: C: superconductivity. - Amsterdam
Volume/pages
222(1994) :1-2 , p. 19-26
ISSN
0921-4534
ISI
A1994NB49400004
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
A new superconducting mercury oxycarbonate, Pb0.7Hg0.3Sr4Cu2CO3O7, has been synthesized. This tetragonal phase (a = 3.824 angstrom, c= 16.468 angstrom) consists of an intergrowth of two nonsuperconducting compounds, Sr2CuO2CO3 and Pb0.7Hg0.3Sr2CuO5. 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, Pb0.7Hg0.3Sr2+xCa0.7Nd0.3-xCu2O7, 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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