Softening of Cu-O bond stretching phonons in tetragonal HgBa2CuO4+delta.
Phonons in nearly optimally doped HgBa(2)CuO(4+delta) were studied by inelastic x-ray scattering. The dispersion of the low-energy modes is well described by a shell model, while the Cu-O bond stretching mode at high energy shows strong softening towards the zone boundary, which deviates strongly from the model. This seems to be common in the hole-doped high-T(c) superconducting cuprates, and, based on this work, not related to a lattice distortion specific to each material.
Uchiyama
H
H
Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo 135-0062, Japan.
Baron
A Q R
AQ
Tsutsui
S
S
Tanaka
Y
Y
Hu
W-Z
WZ
Yamamoto
A
A
Tajima
S
S
Endoh
Y
Y