Journal
PHYSICAL REVIEW LETTERS
Volume 88, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.88.167002
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The phonon dispersions of Nd1.86Ce0.14CuO (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 at about q=(0.2, 0, 0). These signatures provide evidence for strong electron-phonon coupling in this electron-doped high-temperature superconductor.
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