Superconductivity above 90 K in the square-planar compound system ABa2Cu3O6+x with A=Y, La, Nd, Sm, Eu, Gd, Ho, Er and Lu

P. H. Hor, R. L. Meng, Y. Q. Wang, L. Gao, Z. J. Huang, J. Bechtold, K. Forster, C. W. Chu

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Abstract

We have found superconductivity in the 90-K range in ABa2Cu3O6+x with A=La, Nd, Sm, Eu, Gd, Ho, Er, and Lu in addition to Y. The results suggest that the unique square planar Cu atoms, each surrounded by four or six oxygen atoms, are crucial to the superconductivity of oxides in general. In particular, the high Tc in ABa2Cu3O6+x is attributed mainly to the quasi two-dimensional assembly of the CuO2-Ba-CuO2+x-Ba-CuO2 layers sandwiched between two A layers, with particular emphasis in the CuO2+x layers. Higher-Tc oxides are predicted for compounds with bigger assemblies of CuO2 layers coupled by Ba-layers.

Original languageEnglish
Pages (from-to)1891-1894
Number of pages4
JournalPhysical review letters
Volume58
Issue number18
DOIs
Publication statusPublished - 1987

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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