Abstract
Temperature dependence of the intra-molecular vibrational modes of C60 in the quasi-1D polymeric RbC60, across the low temperature transition at ∼50K, has been probed through infrared (IR) and Raman spectroscopies. With the lowering of temperature, the split IR modes of RbC60 are seen to harden but below 50K a small but definitive signature of an anomalous softening is observed. In addition, the background IR transmission shows an increase below 50K with the opening of a well defined gap in the electronic spectrum. The implications of these results, along with those of Raman measurements, are discussed in terms of the interaction of intra-molecular phonons with electrons and spin excitations in the system.
Published Version
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