Crystal structure of annealed and as-prepared HgBa2CaCu2O6+δ superconductors

Q. Huang, J. W. Lynn, R. L. Meng, C. W. Chu

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57 引文 斯高帕斯(Scopus)

摘要

Neutron profile refinements have been carried out on powders of as-prepared and oxygen annealed samples of the layered HgBa2CaCu2O6+δ (1212) cuprate superconductors. The crystal structure is tetragonal P4/mmm over the range of temperatures 10 K to 298 K investigated, with no structural transitions of any kind being detected. The extra oxygen that electrically dopes these materials is found to reside in the centered position of the Hg plane, and no other excess oxygen is present in these samples. In addition, we found no conclusive evidence for mixing of the Hg and Cu cations. In the as-prepared sample we found δ=0.22, while the oxygen content increased substantially to δ=0.35 with annealing. This extra oxygen had only a small effect on the superconductivity, broadening the transition somewhat and shifting Tc from 112 K to 120 K. The incorporation of extra oxygen also had the effect of constructing the lattice parameters by ∼ 0.1%. The overall behavior is similar to the single-layer Hg-1201 system.

原文English
頁(從 - 到)356-364
頁數9
期刊Physica C: Superconductivity and its applications
218
發行號3-4
DOIs
出版狀態Published - 1993 十二月 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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