Softening of Cu-O bond stretching phonons in tetragonal HgBa2CuO4+delta |
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Authors: | Uchiyama H Baron A Q R Tsutsui S Tanaka Y Hu W-Z Yamamoto A Tajima S Endoh Y |
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Institution: | Superconductivity Research Laboratory, International Superconductivity Technology Center, 1-10-13 Shinonome, Koto-ku, Tokyo 135-0062, Japan. |
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Abstract: | 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. |
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