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

  • Toulemonde P
  • Odier P
  • Bordet P
 et al. 
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Abstract

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 Pb4+substitution stabilizes the Hg2O2-δlayer 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 Tcmax(82-84 K) is found identical as in (Hg,Tl)-2212 samples suggesting this value to be intrinsic at optimal doping. © 2002 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Crystal structure
  • High-pressure high-temperature synthesis
  • Mercury-based high-Tcsuperconductor
  • Synchrotron X-ray powder diffraction

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Authors

  • P. Toulemonde

  • P. Odier

  • P. Bordet

  • R. Bruyère

  • J. L. Tholence

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