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

Research output: Contribution to journalArticlepeer-review

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

ASJC Scopus subject areas

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

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