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American Physical Society, Physical review B, 14(78), 2008

DOI: 10.1103/physrevb.78.140511

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Sharp optical-phonon softening near optimal doping inLa2−xBaxCuO4+δobserved via inelastic x-ray scattering

Journal article published in 2008 by Matteo d’Astuto, Guy Dhalenne, Jeff Graf, Moritz Hoesch ORCID, Paola Giura, Michael Krisch, Patrick Berthet, Alessandra Lanzara, Abhay Shukla
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This paper is available in a repository.

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Abstract

We report a direct observation of a sharp Kohn-like anomaly in the doubly degenerate copper-oxygen bond-stretching phonon mode occurring at $𝐪\mathrm{=(0.3, 0,0)}$ in La$_{2-x}$Ba$_x$CuO$_{4+δ}$ with $\mathrm{x=0.14\pm0.01}$, thanks to the high $𝐐$ resolution of inelastic x-ray scattering. This anomaly is clearly seen when the inelastic signal is analysed using a single mode but is also consistent with a two mode hypothesis possibly due to a splitting of the degenerate modes due to symmetry breaking stripes. Our observation shows that the effect persists at the stripe propagation vector in a superconducting system close to optimal doping.