Superconducting properties versus oxygen content in a Sr-doped HgBa2Ca1-xSrxCu2O 6+δ

N. H. Hur, N. H. Kim, Y. K. Park, J. C. Park, D. H. Choy, H. G. Lee, H. S. Shin, I. S. Yang

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Polycrystalline samples of HgBa2Ca1-xSrxCu2O 6+δ were prepared by solid state reaction of HgO, Ba2CuO3+δ and Ca1-xSrCuO2 (x=0.14) in an evacuated silica tube. The as-synthesized sample has a Tc of 120 K and has tetragonal symmetry ( P4 mmm) with lattice parameters of a=3.8584(1) A ̊ and c=12.6646(5) A ̊. After annealing under O2 at 250 °C for 8 h, the Tc was enhanced to 124 K. The content of oxygen uptakes is about 0.11, which was estimated by a TGA analysis. However, the X-ray powder diffraction data and the Raman spectra of both as-synthesized and oxygen-annealed samples did not show any substantial difference.

Original languageEnglish
Pages (from-to)907-908
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Issue numberPART 2
StatePublished - Dec 1994


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