Optimal and overdoped superconducting regimes in Hg-2212 system by Pb substitution

Lead substitutions on Hg site and Ca substitutions on Y site have been studied in the Hg-2212 compound in order to reach its optimal doping composition. The unit cell evolution has been studied by powder X-ray diffraction and the structure refined from X-ray synchrotron powder diffraction data. The...

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Published in:Physica. C, Superconductivity Superconductivity, 2002-01, Vol.366 (3), p.147-156
Main Authors: Toulemonde, P, Odier, P, Bordet, P, Bruyère, R, Tholence, J.L
Format: Article
Language:English
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Crystal structure
High-pressure high-temperature synthesis
Mercury-based high- Tc superconductors
Synchrotron X-ray powder diffraction
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description Lead substitutions on Hg site and Ca substitutions on Y site have been studied in the Hg-2212 compound in order to reach its optimal doping composition. The unit cell evolution has been studied by powder X-ray diffraction and the structure refined from X-ray synchrotron powder diffraction data. The Pb 4+ substitution stabilizes the Hg 2O 2− δ layer allowing full Ca substitution on the Y site. The Ca doping makes the Ba–O2 plane to move away from the Hg–O3 plane, it also reduces the buckling which remains still high (9.7°). The superconducting transitions correspond to optimally and overdoped samples. The T c max (82–84 K) is found identical as in (Hg,Tl)-2212 samples suggesting this value to be intrinsic at optimal doping.
doi_str_mv 10.1016/S0921-4534(01)00908-X
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subjects Crystal structure
High-pressure high-temperature synthesis
Mercury-based high- Tc superconductors
Synchrotron X-ray powder diffraction
title Optimal and overdoped superconducting regimes in Hg-2212 system by Pb substitution
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