Subgap optical absorption induced by quantum lattice fluctuations at the Peierls edge in PtCl chain complexes

Noritaka Kuroda, Masato Nishida, Masahiro Yamashita

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3 Citations (Scopus)


The temperature dependence of the low-energy tail of the interband optical absorption band at the Peierls edge has been studied in halogen-bridged linear-chain complexes, [Pt(en(Formula presented)][Pt(en(Formula presented)(Formula presented)]((Formula presented)(Formula presented) and [Pt(en(Formula presented)][Pt(en(Formula presented)(Formula presented)]((Formula presented)(Formula presented), en being ethylenediamine. The absorption spectrum and its temperature dependence are explained well in terms of the subgap density of states of the one-dimensional electronic bands induced by the quantum vibration of Cl ions of the breathing mode. Both substances are found to have a dimensionless electron-phonon coupling constant of λ≊1.2, the zero-temperature gap parameter of (Formula presented)≊1.45 eV, and the transfer integral of (Formula presented)≊0.4 eV. Because of the strong electron-phonon coupling the temperature dependence of the energy gap is dominated by the self-energy effect; even at 0 K the self-energy amounts to 0.07-0.08 eV, being considerably greater than the self-energies in usual semiconductors. The role of the anharmonicity of the chainlike Pt-Cl bonds is discussed in relation to the origin of the large gap parameter.

Original languageEnglish
Pages (from-to)2390-2396
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number4
Publication statusPublished - 1996 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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