Author/Authors :
Sekine، نويسنده , , T. and Kamioka، نويسنده , , T. and Kawano، نويسنده , , R. and Tsutsumi، نويسنده , , K. and Tanokura، نويسنده , , Y. and Aonuma، نويسنده , , S. and Sawa، نويسنده , , H. and Kato، نويسنده , , R.، نويسنده ,
Abstract :
Raman scattering was measured in the organic conductor (DMe-DCNQI)2Cu in order to study the metal-insulator (M-I) and reentrant phase transitions. The effects of the ordering of the Cu ions in the mixed valence state were observed in the low-frequency phonon Raman peaks of the deuterated salts as the temperature was decreased towards the M-I transition. Moreover we observed a sudden broadening of the low-frequency Raman spectrum around the reentrant transition temperature in the -d2 deuterated salt, indicating the disorder of the Cu ions in the low-temperature metallic phase. The peaks became sharp again as the temperature was decreased below about 20 K.
