The Cu-O bond-stretching phonon anomaly previously seen in Sr-doped LSCO also appears in oxygen-doped La2CuO4+δ and co-doped LSCO6+O, is insensitive to a 10 T field, and points to dynamic charge stripe fluctuations.
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Anomalous Dispersion of LO Phonons in Oxygen-Doped La$_{2-x}$Sr$_{x}$CuO$_{4+\delta}$
The Cu-O bond-stretching phonon anomaly previously seen in Sr-doped LSCO also appears in oxygen-doped La2CuO4+δ and co-doped LSCO6+O, is insensitive to a 10 T field, and points to dynamic charge stripe fluctuations.