The characteristics of orthorhombicity of YBa2Cu3O7-δ in superconducting state

Y. Fujii, Y. Soejima, A. Okazaki, I. K. Bdikin, G. A. Emel'Chenko, A. A. Zhokhov

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9 Citations (Scopus)


The temperature dependence of the lattice constants a, b and c of YBa2Cu3O7-δ (δ = 0.5) has been determined in a range 28-300 K by high-angle double-crystal X-ray diffractometry, and examined near the superconducting transition temperature Tc = 55 K. The angle φ that is related to the orthorhombicity of the crystal as φ = tan-1 (a/b) decreases with decreasing temperature; it is found, however, that at Tc the decrease starts to slow down. The difference between φ observed and that extrapolated from the normal state is proportional to (1 - T/Tc)ξ. This is new behaviour in connection with the onset of superconductivity, and is discussed in terms of a change in the bond strength around Cu atoms. By comparing the results with that of a specimen with δ ∼ 0.2 (Tc ∼ 90 K) in literature, it is shown that, owing to weaker bond strength around Cu atoms, the crystal with δ = 0.5 exhibits the behaviour more clearly.

Original languageEnglish
Pages (from-to)49-55
Number of pages7
JournalPhysica C: Superconductivity and its applications
Issue number1-2
Publication statusPublished - 2002

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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