Anomalous dispersion of longitudinal optical phonons in oxygen-doped La2-xSrxCuO4+δ

Tim Tejsner, Andrea Piovano, Ana Tutueanu, Astrid T. Romer, Barrett O. Wells, Jean-Claude Grivel, Martin Boehm, Linda Udby

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Abstract

Inelastic neutron scattering has been used to study the in-plane Cu-O bond-stretching mode in oxygendoped La1.94Sr0.06CuO4.035 (T-c = 38 K) and La2CuO4+delta (T-c = 43 K). Similar to results from optimally doped La1.85Sr0.15CuO4 (T-c = 35 K), we observe anomalous features in the dispersion of this half-breathing mode in the form of a softening halfway through the Brillouin zone. Considering the differences in electronic structure and local environment between the oxygen- and strontium-doped compounds with similar T-c, we rule out a connection between the phonon anomaly and structural instabilities related to the specific dopant type. We interpret the phonon anomaly as a signature of correlated charge fluctuations ubiquitous in optimally doped superconductors.
Original languageEnglish
JournalPhysical Review B
Volume101
Issue number10
Number of pages6
ISSN1098-0121
DOIs
Publication statusPublished - 2020

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