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; Ayako Yamamoto; S. Tajima; Y. Endoh

doi:10.1103/PhysRevLett.92.197005

Softening of Cu-O bond stretching phonons in tetragonal HgBa ₂CuO_4+δ

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

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62 Citations (Scopus)

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 language	English
Pages (from-to)	197005-197001
Number of pages	5
Journal	Physical Review Letters
Volume	92
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.92.197005
Publication status	Published - 2004 May 14
Externally published	Yes

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ASJC Scopus subject areas

Physics and Astronomy(all)

Cite this

Uchiyama, H., Baron, A. Q. R., Tsutsui, S., Tanaka, Y., Hu, W. Z., Yamamoto, A., ... Endoh, Y. (2004). Softening of Cu-O bond stretching phonons in tetragonal HgBa ₂CuO_4+δ Physical Review Letters, 92(19), 197005-197001. https://doi.org/10.1103/PhysRevLett.92.197005

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AU - Tajima, S.

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AB - 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.

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10.1103/PhysRevLett.92.197005