Temperature- and pressure-induced charge-density-wave to Mott-Hubbard phase transitions in quasi-one-dimensional bromine-bridged Pd compounds

Hiroyuki Matsuzaki, Shinya Takaishi, Mitsuhito Takamura, Shohei Kumagai, Masahiro Yamashita, Hiroshi Okamoto

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Temperature- and pressure-induced transitions from the charge-density-wave (CDW) phase to the Mott-Hubbard (MH) phase in the quasi-one-dimensional Br-bridged Pd compound, [Pd(en) 2Br](Cn-Y) 2·H 2O (n = 4-9, and 12) (en: ethylenediamine, C n-Y: dialkyl-sulfosuccinate), were investigated by means of crystal-structure analyses and Raman spectroscopy. From the systematic evaluations of the bridging-bromine displacements δ reflecting the CDW amplitudes, the distance L between the neighboring two Pd ions, and the Raman frequency ωS of the symmetric Pd-Br stretching mode, we demonstrated that ωS is a good measure of the CDW amplitude. By scrutinizing the variations of ωS in the pressure-induced and the temperature-induced CDW-to-MH transitions, we discuss the nature of the CDW to- MH transitions in this category of materials.

Original languageEnglish
Article number074705
Journaljournal of the physical society of japan
Volume81
Issue number7
DOIs
Publication statusPublished - 2012 Jul

Keywords

  • Charge density wave
  • Extended Peierls-Hubbard model
  • Mott-Hubbard phase
  • Phase transition
  • Raman spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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