Sharp optical phonon softening close to optimal doping in La$_{2-x}$Ba$_x$CuO$_{4+δ}$

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dc.creatorD'Astuto, Matteo
dc.creatorDhalenne, Guy
dc.creatorGraf, Jeff
dc.creatorHoesch, Moritz
dc.creatorGiura, Paola
dc.creatorKrisch, Michael
dc.creatorBerthet, Patrick
dc.creatorLanzara, Alessandra
dc.creatorShukla, Abhay
dc.date2008-08-25
dc.date2008-10-01
dc.date.accessioned2026-07-07T10:14:26Z
dc.date.available2026-07-07T10:14:26Z
dc.descriptionWe report a direct observation of a sharp Kohn-like anomaly in the doubly degenerate copper-oxygen bond-stretching phonon mode occurring at $\mathbf{q}\mathrm{=(0.3, 0,0)}$ in La$_{2-x}$Ba$_x$CuO$_{4+δ}$ with $\mathrm{x=0.14\pm0.01}$, thanks to the high $\mathbf{Q}$ 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.
dc.identifierhttps://arxiv.org/abs/0808.3354
dc.identifierhttp://arxiv.org/abs/0808.3354
dc.identifierPhysical Review B 78 (2008) 140511(R)
dc.identifierdoi:10.1103/PhysRevB.78.140511
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/172879
dc.subjectStrongly Correlated Electrons
dc.titleSharp optical phonon softening close to optimal doping in La$_{2-x}$Ba$_x$CuO$_{4+δ}$
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