Optical and transport studies of Ni(dmi-based organic conductors

H. Liu, D. Tanner, A. Pullen, K. Abboud, J. Reynolds

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Abstract

Single-crystal Ni(dmit(Formula presented) salts, ((Formula presented)P)[Ni(dmit(Formula presented)(Formula presented), ((Formula presented)N(Formula presented)[Ni(dmit(Formula presented)(Formula presented)⋅(Formula presented)CN, and ((Formula presented)S)[Ni(dmit(Formula presented)(Formula presented), have been synthesized. All show semiconducting behavior in their temperature-dependent dc conductivities. Room-temperature polarized reflectance measurements have been made over the range between 100 and 32 000 (Formula presented) (12 meV-4 eV). For light polarized along the Ni(dmit(Formula presented) stacking axis, all spectra show an energy gap, with superimposed vibrational fine structure at low frequencies and charge-transfer bands at high frequencies. Band gaps determined from the optical conductivities are consistent with thermal activation energies from dc transport measurements. The stacking-axis conductivity shows the effect of electron-molecular vibration interaction; analysis for ((Formula presented)S)[Ni(dmit(Formula presented)(Formula presented) yields a dimensionless electron-phonon coupling constant λ∼0.27. For light polarized perpendicular to the stacking axis, only weak vibrational features are observed.

Original languageEnglish
Pages (from-to)10557-10568
Number of pages12
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume53
Issue number16
DOIs
Publication statusPublished - 1996 Jan 1

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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