Abstract
The infra-red spectra of a large number of ternary Cu(II) oxides with at least a quasi square-planar coordination of oxygen around the copper ions have been studied. The frequency of the bands with the highest frequency,v max, is found to correlate extremely well with the shortest Cu−O distance.v max increases at an impressive rate of ∼20 cm−1 per 0.01 Å when the Cu−O distance becomes less than 1.97 Å, which is the Cu2+−O2− distance in square-planar CuO4 complexes as obtained from empirical ionic radii considerations. The marked sensitivity may be used as a “titration” procedure not only to assign bands but also to obtain diagnostic information about local coordination in compounds derived, for example, from the YBa2Cu3O7−d structure such as LaCaBaCu3O7−d . The only example where this correlation fails is in the two-layer non-superconducting oxides derived from La2(Ca, Sr)Cu2O6. The significance of this result is discussed. The marked dependence of frequency on the bond-distance is qualitatively examined in terms of an increased electron-phonon coupling to account for the observed tendency of the superconducting transition temperature to go through a maximum as the average basal plane Cu−O distance is decreased.
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Ganguly, P., Infante, C., Siddiqi, S.A. et al. Correlations between frequency of infra-red active vibrational modes and copper-oxygen distance in copper oxides. Application to superconductors. Z. Physik B - Condensed Matter 83, 23–30 (1991). https://doi.org/10.1007/BF01314393
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DOI: https://doi.org/10.1007/BF01314393