d'Astuto M, Mang P K, Giura P, Shukla A, Ghigna P, Mirone A, Braden M, Greven M, Krisch M, Sette F
European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France.
Phys Rev Lett. 2002 Apr 22;88(16):167002. doi: 10.1103/PhysRevLett.88.167002. Epub 2002 Apr 3.
The phonon dispersions of Nd(1.86)Ce(0.14)CuO(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.
通过非弹性X射线散射确定了Nd(1.86)Ce(0.14)CuO(4+δ)沿[ξ,0,0]方向的声子色散。与未掺杂的母体化合物相比，与Cu-O键拉伸和面外氧振动相关的两个最高纵向声子分支的能量向更低处移动。此外，在约q = (0.2,0,0)处观察到键拉伸带的异常软化。这些特征为这种电子掺杂高温超导体中的强电子-声子耦合提供了证据。
