Electron-phonon interaction in n-doped cuprates: an Inelastic X-ray Scattering study

Abstract

Inelastic x-ray scattering (IXS) with very high (meV) energy resolution has become a valuable spectroscopic tool, complementing the well established coherent inelastic neutron scattering (INS) technique for phonon dispersion investigations. In the study of crystalline systems IXS is a viable alternative to INS, especially in cases where only small samples are available. Using IXS, we have measured the phonon dispersion of Nd_{1.86}Ce_{0.14}CuO_{4+δ} along the [x,0,0] and [x,x,0] in-plane directions. Compared to the undoped parent compound, the two highest longitudinal optical (LO) phonon branches are shifted to lower energies because of Coulomb-screening effects brought about by the doped charge carriers. An additional anomalous softening of the highest branch is observed around q=(0.2,0,0). This anomalous softening, akin to what has been observed in other compounds, provides evidence for a strong electron-phonon coupling in the electron-doped high-temperature superconductors.

arXiv commentProceedings of the SATT11 conference, Vietri sul Mare - Italy (March 2002); accepted for publication on Int. J. Mod. Phys. B

References in corpus (3)

• Anomalous electronic structure and pseudogap effects in Nd_1.85Ce_0.15CuO_4
• Anomalous Dispersion of Longitudinal Optical Phonons in $\mathbf{N}{\mathbf{d}}_{1.86}\mathbf{C}{\mathbf{e}}_{0.14}\mathbf{Cu}{\mathbf{O}}_{4+\mathbf{\delta }}$ Determined by Inelastic X-ray Scattering
• Bond-Stretching-Phonon Anomalies in Stripe-Ordered La(1.69)Sr(0.31)NiO(4)

Cited by in corpus (9)

• Dispersion of the high-energy phonon modes in Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_4$
• Demonstration of resonant inelastic X-ray scattering as a probe of exciton-phonon coupling
• Phonon dispersion in 1-layer cuprate HgBa2CuO4+d
• Phonon anomalies and lattice dynamics in superconducting oxychlorides Ca${}_{2-x}$CuO${}_2$Cl
• A microscopic modeling of phonon dynamics and charge response in NdCuO
• Phonon anomalies with doping in superconducting oxychlorides Ca2-xCuO2Cl2
• Phonon dispersion and anomalies in one-layer high-temperature superconductors
• Dynamic charge inhomogenity in cuprate superconductors
• Nonlocal electron-phonon interaction as a source of dynamic charge stripes in the cuprates