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Related Experiment Videos

Four-unit-cell superstructure in the optimally doped YBa2Cu3O6.92 superconductor.

Zahirul Islam1, X Liu, S K Sinha

  • 1Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA. zahir@aps.anl.gov

Physical Review Letters
|November 5, 2004
PubMed
Summary

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Optimally doped YBa2Cu3O6.92 superconductor exhibits a 4-unit-cell superlattice structure. This intrinsic modulation, with anisotropic atomic displacements, influences the lattice and electronic properties of yttrium-barium-copper-oxides.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Yttrium-barium-copper-oxide (YBCO) is a high-temperature superconductor.
  • Understanding the structural basis of superconductivity in YBCO is crucial for technological applications.

Purpose of the Study:

  • To investigate the intrinsic structural modulations in optimally doped YBa2Cu3O6.92.
  • To determine the nature and extent of atomic displacements and their correlation with electronic properties.

Main Methods:

  • Diffuse x-ray scattering measurements were employed.
  • Analysis focused on identifying superlattice formation and atomic positional correlations.

Main Results:

  • A kinetically limited 4-unit-cell superlattice with wavevector q(0)=(1/4, 0, 0) was observed.

Related Experiment Videos

  • Anisotropic displacements of Cu, Ba, and O atoms were identified, correlated over 3-6 unit cells.
  • The observed structure is consistent with an oxygen-ordered "ortho-IV" phase.

    • Conclusions:

    • The optimally doped YBa2Cu3O6.92 superconductor possesses an intrinsic superlattice structure.
    • Long-range lattice strains generated by these modulated regions contribute to an inhomogeneous lattice.
    • This lattice inhomogeneity may significantly impact the electronic properties of YBCO superconductors.