Deviation from Linearity of the Cu-O Chains in Orthorhombic YBa2Cu3O7 by High-Resolution Neutron Powder Diffraction

  • M. François
  • A. Junod
  • K. Yvon
  • A. W. Hewat


The structure of orthorhombic YBa2Cu3O6.91 (Tc=90K) was refined from high-resolution data (sinθ/λ)max=0.91\(\dot A\) −1) in the temperature range between 5K and 320K. The oxygen atoms on the so-called linear Cu-O chains occupy potential minima which are displaced from the chain axis along [100] by at least 0.08(1)\(\dot A\) at all temperatures. The Cu-O-Cu bond angle of the resulting Cu-O zig-zag chains, α=175(1)°, does not vary significantly as a function of temperature below Tc.


Chain Axis Electron Diffraction Experiment Powder Diffraction Experiment Linear Chain Model Diffuse Scattering Intensity 
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Copyright information

© Springer Science+Business Media New York 1988

Authors and Affiliations

  • M. François
    • 1
  • A. Junod
    • 1
  • K. Yvon
    • 1
  • A. W. Hewat
    • 2
  1. 1.Université de GenèveGenèveSwitzerland
  2. 2.Institut Laue-LangevinGrenobleFrance

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