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

Abstract

The phonon dispersions of $\mathrm{N}{\mathrm{d}}_{1.86}\mathrm{C}{\mathrm{e}}_{0.14}\mathrm{Cu}{\mathrm{O}}_{4+\delta }$ along the $[\xi ,0,0]$ direction have been determined by inelastic x-ray scattering. Compared to the undoped parent compound, the two highest longitudinal phonon branches, associated with the Cu-O bond-stretching and out-of-plane oxygen vibration, are shifted to lower energies. Moreover, an anomalous softening of the bond-stretching band is observed around $\mathbf{q}=(0.2,0,0)$. These signatures provide evidence for strong electron-phonon coupling in this electron-doped high-temperature superconductor.

4 pages, 4 figures

References in corpus (1)

• Anomalous electronic structure and pseudogap effects in Nd_1.85Ce_0.15CuO_4

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