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Reply to "Comment on 'Axial oxygen-centered lattice instabilities in YBa_2Cu_3O_7: an application of the analysis of extended X-ray-absorption fine structure in anharmonic systems'"

The authors assert that the one-site Cu(1)-O(4) model, suggested in the Comment by Thomsen and Cardona (Phys. Rev. B 47, 12320 (1993)) is inconsistent with polarized X-ray-absorption fine-structure and diffraction results. The authors also show that the two- site Cu(1)-O(4) distribution is not inconsistent with optical measurements, although a rigid double-well modeling of this distribution is (Phys. Rev. Lett. 68, 3236 (1992)).

high temperature superconductors ; axial O centred lattice instabilities ; extended X-ray-absorption fine structure ; anharmonic systems

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