Temperature dependence of electronic optical absorption in (NMe4+· TCNQ-·)2TCNQ
- Kuroda, Noritaka
- Hasanudin
- Sugimoto, Toyonari
- Ueda, Kazumasa
- Kohama, Masayoshi
- Toyota, Naoki
- クロダ, ノリタカ
- ハサヌディン
- スギモト, トヨナリ
- ウエダ, カズマサ
- コハマ, マサヨシ
- トヨタ, ナオキ
- 黒田, 規敬
- 杉本, 豊成
- 植田, 一正
- 小浜, 雅圭
- 豊田, 直樹
DOIAbstract
The temperature dependence of the linearly polarized optical absorption spectrum has been measured in single crystals of (NMe4+·TCNQ−·)2TCNQ, where NMe4 and TCNQ are tetramethylammonium and tetracyanoqui nodi methane, respectively, in the temperature range between −100 and +150 ℃. In addition to intense TCNQ−· dimer bands, strongly temperature-dependent satellite bands appear at around 1.3 eV and 1.9 eV. The singular behavior of the intensity and peak position of the 1.3 eV band shows that a second order phase transition takes place at 126 ℃. The origin of this band is discussed in relation to the mechanism of the phase transition
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