Phonon softening in HgBa2CuO4+δ and MgB 2

H. Uchiyama, A. Q R Baron, S. Tsutsui, Y. Tanaka, D. Ishikawa, S. Lee, W. Z. Hu, Ayako Yamamoto, R. Heid, K. P. Bohnen, T. Ishikawa, S. Tajima, Y. Endoh

Research output: Contribution to journalArticle

Abstract

Phonon dispersion of two superconductors was studied with using inelastic X-ray scattering. In MgB2, which is thought as a Eliashberg type superconductor, the phonon dispersion shows softening of the E2g mode around Γ in the [100] direction, in excellent agreement with ab initio calculations. It supports the idea that this phonon gives main contribution to the superconductivity. In HgBa2CuO4+δ, on the other hand, which is a good candidate for phonon measurement in the high-Tc cuprates, the dispersion shows anomalous softening of the bond stretching mode at q∼0.3 in the [100] direction. The softening does not agree with shell model calculations well, suggesting existence of spatial charge fluctuation with periodicity of q∼0.3.

Original languageEnglish
Pages (from-to)294-297
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Volume67
Issue number1-3
DOIs
Publication statusPublished - 2006 Jan
Externally publishedYes

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softening
Superconducting materials
Inelastic scattering
Superconductivity
X ray scattering
cuprates
Stretching
periodic variations
superconductivity
scattering
x rays
Direction compound

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Uchiyama, H., Baron, A. Q. R., Tsutsui, S., Tanaka, Y., Ishikawa, D., Lee, S., ... Endoh, Y. (2006). Phonon softening in HgBa2CuO4+δ and MgB 2 Journal of Physics and Chemistry of Solids, 67(1-3), 294-297. https://doi.org/10.1016/j.jpcs.2005.10.072

Phonon softening in HgBa2CuO4+δ and MgB 2 . / Uchiyama, H.; Baron, A. Q R; Tsutsui, S.; Tanaka, Y.; Ishikawa, D.; Lee, S.; Hu, W. Z.; Yamamoto, Ayako; Heid, R.; Bohnen, K. P.; Ishikawa, T.; Tajima, S.; Endoh, Y.

In: Journal of Physics and Chemistry of Solids, Vol. 67, No. 1-3, 01.2006, p. 294-297.

Research output: Contribution to journalArticle

Uchiyama, H, Baron, AQR, Tsutsui, S, Tanaka, Y, Ishikawa, D, Lee, S, Hu, WZ, Yamamoto, A, Heid, R, Bohnen, KP, Ishikawa, T, Tajima, S & Endoh, Y 2006, 'Phonon softening in HgBa2CuO4+δ and MgB 2 ', Journal of Physics and Chemistry of Solids, vol. 67, no. 1-3, pp. 294-297. https://doi.org/10.1016/j.jpcs.2005.10.072
Uchiyama H, Baron AQR, Tsutsui S, Tanaka Y, Ishikawa D, Lee S et al. Phonon softening in HgBa2CuO4+δ and MgB 2 Journal of Physics and Chemistry of Solids. 2006 Jan;67(1-3):294-297. https://doi.org/10.1016/j.jpcs.2005.10.072
Uchiyama, H. ; Baron, A. Q R ; Tsutsui, S. ; Tanaka, Y. ; Ishikawa, D. ; Lee, S. ; Hu, W. Z. ; Yamamoto, Ayako ; Heid, R. ; Bohnen, K. P. ; Ishikawa, T. ; Tajima, S. ; Endoh, Y. / Phonon softening in HgBa2CuO4+δ and MgB 2 In: Journal of Physics and Chemistry of Solids. 2006 ; Vol. 67, No. 1-3. pp. 294-297.
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AU - Lee, S.

AU - Hu, W. Z.

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