A model for the vibrational and vibronic features of the infrared spectra of a quarter-filled system is reported and shown to be able to characterise the BOT Sr and CDW ground state of these compounds. The infrared spectra of (DI-DCNQI)(2)Ag and of the corresponding compounds with Li and Cu are analysed. In particular for the Ag compound one finds that a 4k(F) BOW begins to develop from room temperature and that a CDW develops below 200 K. The understanding of the periodicity of the low temperature BCDW necessitates further investigations.
Study of the phase transitions of (DI-DCNQI)(2)X using vibronic and vibrational spectra
MENEGHETTI, MORENO;PECILE, CESARE;
2001
Abstract
A model for the vibrational and vibronic features of the infrared spectra of a quarter-filled system is reported and shown to be able to characterise the BOT Sr and CDW ground state of these compounds. The infrared spectra of (DI-DCNQI)(2)Ag and of the corresponding compounds with Li and Cu are analysed. In particular for the Ag compound one finds that a 4k(F) BOW begins to develop from room temperature and that a CDW develops below 200 K. The understanding of the periodicity of the low temperature BCDW necessitates further investigations.
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