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Doped antiferromagnets host a vast array of physical properties and learninghow to control them is one of the biggest challenges of condensed matterphysics. La$_{1.7}$Sr$_{0.3}$NiO$_4$ (LSNO) is a classic example of such amaterial. At low temperatures holes introduced via substitution of La by Srsegregate into lines to form boundaries between magnetically ordered domains inthe form of stripes. The stripes become dynamic at high temperatures, but LSNOremains insulating presumably because an interplay between magneticcorrelations and electron-phonon coupling localizes charge carriers. Magneticdegrees of freedom have been extensively investigated in this system, butphonons are almost completely unexplored. We searched for electron-phononanomalies in LSNO by inelastic neutron scattering. Giant renormalization ofplane Ni-O bond-stretching modes that modulate the volume around Ni appears onentering the dynamic charge stripe phase. Other phonons are a lot lesssensitive to stripe melting. Dramatic overdamping of the breathing modesindicates that dynamic stripe phase may host small polarons. We argue that thisfeature sets electron-phonon coupling in nickelates apart from that in cuprateswhere breathing phonons are not overdamped and point out remarkablesimilarities with the colossal magnetoresistance (CMR) manganites.

Giant electron-phonon coupling of the breathing plane oxygen phonons in the dynamic stripe phase of La$_{1.67}$Sr$_{0.33}$NiO$_4$