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

Details Softening of Cu-O bond stretching phonon in tetragonal HgBa$_2$CuO$_{4+δ}$ Softening of Cu-O bond stretching phonon in tetragonal HgBa$_2$CuO$_{4+δ}$

2004-03-14

arxiv.org/abs/cond-mat/0403343v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.92.197005

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-$T_\mathrm{c}$ superconducting cuprates, and, based on this work, not related to a lattice distortion specific to each material.

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