Infrared Spectroscopic Study of Phase Transisions in A1c60 Compounds (a=K,Rb,Cs)

Daniel Koller; Michael C. Martin; Laszlo Mihaly

paper

Infrared Spectroscopic Study of Phase Transisions in A1c60 Compounds (a=K,Rb,Cs)

arXiv:cond-mat/9405033

Abstract

Optical measurements on doped C $_{60}$ films provide evidence for a transition from a high temperature conducting phase to a low temperature insulating phase in quenched Rb $_{1}$ C $_{60}$ and K $_{1}$ C $_{60}$ compounds, while Cs $_{1}$ C $_{60}$ did not exhibit this behavior. For slow cooled samples our study confirms earlier results indicating phase separation of K $_{1}$ C $_{60}$ to K $_{3}$ C $_{60}$ and C $_{60}$ , and the formation of a new Rb $_{1}$ C $_{60}$ phase at low temperatures. Upon slow cooling Cs $_{1}$ C $_{60}$ behaves similar to Rb $_{1}$ C $_{60}$ .

To be published in Mol. Cryst. Liq. Cryst., Procceding of 1994 Salt Lake City conference on Fullerenes. Postscript file including figures. SLCDOPE