Softening of Cu-O bond stretching phonons in tetragonal HgBa 2CuO4+δ

H. Uchiyama, A. Q.R. Baron, S. Tsutsui, Y. Tanaka, W. Z. Hu, A. Yamamoto, S. Tajima, Y. Endoh

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Abstract

The phonon dispersion of Hg1201 was studied using inelastic x-ray scattering. The crystallinity was examined using x-ray diffraction, and four spherically curved analyzer crystals were used on the 10 m horizontal arm to analyze the scattered radiation. Magnetic susceptibility measurement showed a sharp superconductivity transition at 94 K, indicating that the sample was nearly optimally doped. The results show that the shell model described well the dispersion of the low-energy modes, while the Cu-O bond stretching mode at high energy showed strong softening towards the zone boundary, deviating strongly from the model.

Original languageEnglish
Article number203601
Pages (from-to)197005-1-197005-4
JournalPhysical Review Letters
Volume92
Issue number19
DOIs
Publication statusPublished - 2004 May 14
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Uchiyama, H., Baron, A. Q. R., Tsutsui, S., Tanaka, Y., Hu, W. Z., Yamamoto, A., Tajima, S., & Endoh, Y. (2004). Softening of Cu-O bond stretching phonons in tetragonal HgBa 2CuO4+δ. Physical Review Letters, 92(19), 197005-1-197005-4. [203601]. https://doi.org/10.1103/PhysRevLett.92.197005