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The crystal structure, electronic structure and superconductivity of bismuth(2)strontium(2)calcium(1-x)yttrium(x)copper(2)oxygen(8+y).

Author(s) : WANG N. L., ZHANG Q. R., CHEN Z. Y., ZHU Y. J., QIAN Y. T., LIU X. M., YANG L.

Type of article: Article

Summary

The effect of yttrium substitution for calcium on the crystal structure and the electronic states of this superconductor was studied by X-ray diffraction and transmission electron microscopy, and by X-ray photoelectron spectroscopy, respectively. It is found that extra oxygen atoms residing within the double bismuth-oxygen layers give rise to a decrease of the modulation period of the incommensurate superlattice along the b axis. As calcium is completely substituted by yttrium, periods of two modulation structures can exist. The electronic structure is analyzed and a comparison is made with the YBCO system. The results suggest that the variation of superconductivity is not caused by the slight change in crystal structure but rather by the hole filling in the O2p orbitals in the copper-oxide layers.

Details

  • Original title: The crystal structure, electronic structure and superconductivity of bismuth(2)strontium(2)calcium(1-x)yttrium(x)copper(2)oxygen(8+y).
  • Record ID : 1993-1854
  • Languages: English
  • Source: Sci. China, A - vol. 35 - n. 7
  • Publication date: 1992/07
  • Document available for consultation in the library of the IIR headquarters only.

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