The characteristics of orthorhombicity of YBa2Cu3O7-δ in superconducting state

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

Research output: Contribution to journalArticle

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Abstract

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
Volume377
Issue number1-2
DOIs
Publication statusPublished - Aug 20 2002

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Crystals
crystals
Atoms
Superconductivity
X ray diffraction analysis
Superconducting transition temperature
Lattice constants
atoms
superconductivity
transition temperature
Temperature
temperature dependence
barium copper yttrium oxide
x rays
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

The characteristics of orthorhombicity of YBa2Cu3O7-δ in superconducting state. / Fujii, Y.; Soejima, Yuji; Okazaki, A.; Bdikin, I. K.; Emel'Chenko, G. A.; Zhokhov, A. A.

In: Physica C: Superconductivity and its applications, Vol. 377, No. 1-2, 20.08.2002, p. 49-55.

Research output: Contribution to journalArticle

Fujii, Y. ; Soejima, Yuji ; Okazaki, A. ; Bdikin, I. K. ; Emel'Chenko, G. A. ; Zhokhov, A. A. / The characteristics of orthorhombicity of YBa2Cu3O7-δ in superconducting state. In: Physica C: Superconductivity and its applications. 2002 ; Vol. 377, No. 1-2. pp. 49-55.
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AU - Emel'Chenko, G. A.

AU - Zhokhov, A. A.

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