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, A. Yamamoto, R. Heid, K. P. Bohnen, T. Ishikawa, S. Tajima, Y. Endoh

研究成果: Article


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.

ジャーナルJournal of Physics and Chemistry of Solids
出版物ステータスPublished - 2006 1 1

ASJC Scopus subject areas

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

フィンガープリント Phonon softening in HgBa<sub>2</sub>CuO<sub>4+δ</sub> and MgB <sub>2</sub>' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用

    Uchiyama, H., Baron, A. Q. R., Tsutsui, S., Tanaka, Y., Ishikawa, D., Lee, S., Hu, W. Z., Yamamoto, A., Heid, R., Bohnen, K. P., Ishikawa, T., Tajima, S., & Endoh, Y. (2006). Phonon softening in HgBa2CuO4+δ and MgB 2. Journal of Physics and Chemistry of Solids, 67(1-3), 294-297.