Dispersion of the high-energy phonon modes in Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_4$

Abstract

The dispersion of the high-energy phonon modes in the electron doped high-temperature superconductor Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_4$ has been studied by inelastic neutron scattering. The frequencies of phonon modes with Cu-O bond-stretching character drop abruptly when going from the Brillouin zone center along the [100]-direction; this dispersion is qualitatively similar to observations in the hole-doped cuprates. We also find a softening of the bond-stretching modes along the [110]-direction but which is weaker and exhibits a sinusoidal dispersion. The phonon anomalies are discussed in comparison to hole-doped cuprate superconductors and other metallic perovskites.

References in corpus (1)

• Softening of Cu-O bond stretching phonon in tetragonal HgBa${}_2$CuO${}_{4+\delta }$

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