Far-infrared spectrum of di-tetramethyltetraselenafulvalene hexafluoroarsenate [(TMTSF)2AsF6]
Résumé
New results are presented on the far-infrared properties of the quasi-one-dimensional compound di-tetramethyltetraselenafulvalene hexafluoroarsenate [(TMTSF)2AsF6] below the spin-density-wave (SDW) transition temperature. The infrared conductivity is reduced at frequencies below 60 cm-1 but we do not observe a well-developed energy gap. A 5-cm-1-wide mode centered at zero frequency can be observed with a strength that is consistent with the freezing out of carriers below the SDW transition as observed by dc conductivity. There is no evidence of high metallic single-particle conductivity in our measurements above the transition temperature in the conducting state. A strong continuous absorption in the 50500-cm-1 region can be seen and we associate it with a Holstein absorption with a tr of 0.6, a value that is consistent with the temperature dependence of the dc conductivity.
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