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Title
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Lead-mercury-based superconductors - the 1212-cuprate and the new oxycarbonate
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Author
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Abstract
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| 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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Language
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English
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Source (journal)
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Physica: C : superconductivity. - Amsterdam, 1988, currens
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Publication
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Amsterdam
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North-Holland
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1994
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ISSN
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0921-4534
[print]
1873-2143
[online]
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Volume/pages
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222
:1-2
(1994)
, p. 19-26
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ISI
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A1994NB49400004
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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