Insulating and Conducting Phases of RbC60

Abstract

Optical measurements were performed on thin films of Rb${}_x$C${}_{60}$, identified by X-ray diffraction as mostly $x=1$ material. The samples were subjected to various heat treatments, including quenching and slow cooling from 400K. The dramatic increase in the transmission of the quenched samples, and the relaxation towards the transmission observed in slow cooled samples provides direct evidence for the existence of a metastable insulating phase. Slow cooling results in a phase transition between two electrically conducting phases.

Minor revisions. Submitted to PRB, RevTeX 3.0 file, 2 postscript figures included, ir_dope

References in corpus (1)

• In-Situ Infrared Transmission Study of Rb- and K-Doped Fullerenes

Cited by in corpus (3)

• Observation and Assignment of Silent and Higher Order Vibrations in the Infrared Transmission of C60 Crystals
• Infrared and Raman Evidence for Dimers and Polymers in Rb1C60
• Reversible phase transformation and doubly-charged anions at the surface of simple cubic RbC60