Anomalous Dispersion of LO Phonons in Oxygen-Doped La${}_{2-x}$Sr${}_x$CuO${}_{4+\delta }$

Abstract

Inelastic neutron scattering has been used to study the in-plane Cu-O bond-stretching mode in oxygen doped La${}_{1.94}$Sr${}_{0.06}$CuO${}_{4.035}$ ($T_c=38\text{K}$) and La${}_2$CuO${}_{4+\delta }$ ($T_c=43\text{K}$). Similar to results from optimally doped La${}_{1.85}$Sr${}_{0.15}$CuO${}_4$ ($T_c=35\text{K}$), 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 $T_{\text{c}}$, 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 possibly connected to stripes.

arXiv comment6 pages, 4 figures, Supplemental Material

References in corpus (31)

• Electronic Liquid Crystal Phases of a Doped Mott Insulator
• Assessing the Performance of Recent Density Functionals for Bulk Solids
• Electron-phonon coupling reflecting dynamic charge inhomogeneity in copper-oxide superconductors
• Scale-free structural organization of oxygen interstitials in La2CuO4+y
• Giant phonon anomalies and central peak due to charge density wave formation in YBa${}_2$Cu${}_3$O${}_{6.6}$
• Stripe order, depinning, and fluctuations in La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$ and La${}_{1.875}$Ba${}_{0.075}$Sr${}_{0.050}$CuO${}_4$
• Charge density wave fluctuations in La2-xSrxCuO4 and their competition with superconductivity
• Dynamical charge density fluctuations pervading the phase diagram of a Cu-based high-Tc superconductor
• Dispersive charge density wave excitations and temperature dependent commensuration in Bi2Sr2CaCu2O8+δ
• Optimum inhomogeneity of local lattice distortions in La2CuO4+y
• Rotated stripe order and its competition with superconductivity in La${}_{1.88}$Sr${}_{0.12}$CuO${}_4$
• Magnetic order and superconductivity in LSCO: a review
• High-temperature charge density wave correlations in La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$ without spin-charge locking
• Intercalation and Staging Behavior in Super-Oxygenated $L{a}_{2}Cu{O}_{4+\delta }$
• Formation of Incommensurate Charge Density Waves in Cuprates
• Direct observation of dynamic charge stripes in La2-xSrxNiO4
• Phonon anomalies and dynamic stripes
• Isotope effect and bond-stretching phonon anomaly in high-Tc cuprates
• Evidence for a charge collective mode associated with superconductivity in copper oxides from neutron and x-ray scattering measurements of La${}_{2-x}$Sr${}_x$CuO${}_4$
• Phonon anomalies due to stripe collective modes in high T_c cuprates
• Neutron scattering study of the effects of dopant disorder on the superconductivity and magnetic order in stage-4 La_2CuO_{4+y}
• An Intrinsic Tendency of Electronic Phase Separation into Two Superconducting States in La(2-x)Sr(x)CuO(4+delta)
• Broken relationship between superconducting pairing interaction and electronic dispersion kinks in LSCO
• Electron-phonon anomaly related to charge stripes: static stripe phase versus optimally-doped superconducting La1.85Sr0.15CuO4
• Through a Lattice Darkly -- Shedding Light on Electron-Phonon Coupling in the High T${}_c$ Cuprates
• Neutron scattering studies of Zn-doped La2-xSrxCuO4
• Distinct nature of static and dynamic magnetic stripes in cuprate superconductors
• q-Dependence of the giant bond-stretching phonon anomaly in the stripe compound La1.48Nd0.4Sr0.12CuO4 measured by IXS
• Direct proof of unique magnetic and superconducting phases in superoxygenated high-Tc cuprates
• On Nematicity and Charge Order in Superoxygenated La${}_{2-x}$Sr${}_x$CuO${}_{4+y}$
• Staging superstructures in high-$T_c$ Sr/O co-doped La${}_{2-x}$Sr${}_x$CuO${}_{4+y}$

Cited by in corpus (3)

• Charge Order Lock-in by Electron-Phonon Coupling in La${}_{1.675}$Eu${}_{0.2}$Sr${}_{0.125}$CuO${}_4$
• Emergent Charge Order from Correlated Electron-Phonon Physics in Cuprates
• Structure of Charge Density Waves in La${}_{1.875}$Ba${}_{0.125}$CuO${}_4$