Infrared studies of the phase transition in the organic charge-transfer salt N-propylquinolinium ditetracyanoquinodimethane

J. L. Musfeldt, K. Kamarás, D. B. Tanner

Research output: Contribution to journalArticle

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Abstract

Polarized infrared and optical reflectance spectroscopies were used to study the structural phase transition in the organic charge-transfer salt N-propylquinolinium ditetracyanoquinodimethane. Above the 220-K phase-transition temperature, the spectra are characteristic of other 1:2 semiconducting charge-transfer salts. Three significant changes occur below Tc. First, the midinfrared charge-transfer band can be resolved into two distinct excitations. Second, there is enhanced oscillator strength, indicative of a larger intratetramer transfer integral in the low-temperature phase. Finally, the vibrational lines split into doublets, providing evidence for an uneven charge distribution within the tetramer. The weakly metallic transport properties above Tc are attributed to the uniform charge distribution within the tetramer and the high degree of overlap between the intratetramer and intertetramer charge-transfer bands. The transport properties in the low-temperature phase are dominated by charge localization, which may act to reduce the overlap between these low-energy charge-transfer features.

Original languageEnglish
Pages (from-to)10197-10205
Number of pages9
JournalPhysical Review B
Volume45
Issue number18
DOIs
Publication statusPublished - 1992

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organic charge transfer salts
Charge transfer
Salts
Phase transitions
charge transfer
Infrared radiation
charge distribution
Charge distribution
transport properties
Transport properties
oscillator strengths
transition temperature
Superconducting transition temperature
salts
reflectance
Spectroscopy
Temperature
spectroscopy
excitation

ASJC Scopus subject areas

  • Condensed Matter Physics

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Infrared studies of the phase transition in the organic charge-transfer salt N-propylquinolinium ditetracyanoquinodimethane. / Musfeldt, J. L.; Kamarás, K.; Tanner, D. B.

In: Physical Review B, Vol. 45, No. 18, 1992, p. 10197-10205.

Research output: Contribution to journalArticle

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AB - Polarized infrared and optical reflectance spectroscopies were used to study the structural phase transition in the organic charge-transfer salt N-propylquinolinium ditetracyanoquinodimethane. Above the 220-K phase-transition temperature, the spectra are characteristic of other 1:2 semiconducting charge-transfer salts. Three significant changes occur below Tc. First, the midinfrared charge-transfer band can be resolved into two distinct excitations. Second, there is enhanced oscillator strength, indicative of a larger intratetramer transfer integral in the low-temperature phase. Finally, the vibrational lines split into doublets, providing evidence for an uneven charge distribution within the tetramer. The weakly metallic transport properties above Tc are attributed to the uniform charge distribution within the tetramer and the high degree of overlap between the intratetramer and intertetramer charge-transfer bands. The transport properties in the low-temperature phase are dominated by charge localization, which may act to reduce the overlap between these low-energy charge-transfer features.

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