Optical properties of the cation-deficient platinum chain salt K1.75Pt(CN)41.5H2O

L. H. Greene, D. B. Tanner, A. J. Epstein, Joel S. Miller

Research output: Contribution to journalArticlepeer-review


The room-temperature polarized reflectance of a potassium-deficient platinum chain salt K1.75Pt(CN)41.5H2O [K(def)CP] has been measured in the infrared and visible. The reflectance is strongly anisotropic, with a plasma edge in the red and high reflectance in the infrared for light polarized parallel to the Pt chain axis and almost frequency-independent reflectance for the transverse polarization. Analysis of the plasma edge indicates a nearly-free-electron mass for the conduction electrons. The data show the existence of an energy gap at room temperature and suggest a Peierls transition above room temperature. The parallel polarized reflectance has structure in the infrared which is the first direct evidence for strong coupling of the conduction electrons to the C N stretching vibration of the tetracyanoplatinate unit in quasi-one-dimensional platinum chain conductors.

Original languageEnglish (US)
Pages (from-to)1331-1338
Number of pages8
JournalPhysical Review B
Issue number2
StatePublished - 1982

ASJC Scopus subject areas

  • Condensed Matter Physics


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