Anomalous bond stretching phonons as a probe of charge fluctuations in perovskites

Details Anomalous bond stretching phonons as a probe of charge fluctuations in perovskites Anomalous bond stretching phonons as a probe of charge fluctuations in perovskites

2006-07-17

arxiv.org/abs/cond-mat/0607415v1

Physics

Condensed Matter

Superconductivity

presented at the M2S-HTSC-VIII conference in Dresden

Scientific paper

10.1016/j.physc.2007.03.247

Important information on momentum resolved low energy charge response can be extracted from anomalous properties of bond stretching in plane phonons observed in inelastic neutron and X-ray scattering in cuprates and some other perovskites. We discuss a semiphenomenological model based on coupling of phonons to a single charge mode. The phonon dispersion and linewidth allow to locate the energy of the charge excitation in the mid infrared part of the spectrum and to determine some of its characteristics. New experiments on oxygen isotope substitution could allow to achieve a more detailed description. Corresponding relations following from the model can be used for the interpretation of experiments and as test of the model.

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