Infrared properties of $\hat{I}¸$-type ET charge-transfer salts: $\hat{I}¸$-ET${}_2$CsZn(SCN)${}_4$ vs $\hat{I}¸$-ET${}_2$RbZn(SCN)${}_4$

Abstract

We performed polarized far-infrared reflectance measurements at different temperatures on $\hat{I}¸$-ET${}_2$RbZn(SCN)${}_4$ and $\hat{I}¸$-ET${}_2$CsZn(SCN)${}_4$, two typical charge-transfer salts in a series of isostructural $\hat{I}¸$-ET${}_2$MM'(SCN)${}_4$. The measurements revealed distinct differences in both electronic and vibronic spectra, which provides a clue towards understanding the different metal-insulator transitions of the two salts.

2 pages, to be published in Synthetic Metal (Proceedings of International Conference on Science and Technology of Synthetic Metals)