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 language | English |
|---|---|
| Pages (from-to) | 10557-10568 |
| Number of pages | 12 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 53 |
| Issue number | 16 |
| DOIs | |
| Publication status | Published - 1996 Jan 1 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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Optical and transport studies of Ni(dmi-based organic conductors. / Liu, H.; Tanner, D.; Pullen, A.; Abboud, K.; Reynolds, J.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 53, No. 16, 01.01.1996, p. 10557-10568.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Optical and transport studies of Ni(dmi-based organic conductors
AU - Liu, H.
AU - Tanner, D.
AU - Pullen, A.
AU - Abboud, K.
AU - Reynolds, J.
PY - 1996/1/1
Y1 - 1996/1/1
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.53.10557
DO - 10.1103/PhysRevB.53.10557
M3 - Article
AN - SCOPUS:0000888443
VL - 53
SP - 10557
EP - 10568
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 16
ER -