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Since conventional superconductivity is mediated by phonons, their role inthe mechanism of high temperature superconductivity has been considered veryearly after the discovery of the cuprates. The initial consensus was thatphonons could not produce transition temperatures near 100K, and the maindirection of research focused on nonphononic mechanisms. Subsequent work lastreviewed by L. Pintschovius in 2005 showed that electron-phonon coupling in thecuprates is surprisingly strong for some phonons and its role is controversial.Experiments performed since then identified anomalous behavior of certain Cu-Obond-stretching phonons in cuprates as an important phenomenon that is somehowrelated to the mechanism of superconductivity. A particularly big advance wasmade in the study of doped La2CuO4. This work is reviewed here.

Giant electron-phonon anomaly in doped La2CuO4 and other cuprates