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Infrared phonon anomaly of one-dimensional metallic peanut-shaped C60 polymer

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3 Author(s)
Onoe, J. ; Department of Nuclear Engineering and Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, O-okayama, Meguro, Tokyo 152-8550, Japan ; Takashima, A. ; Toda, Y.

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The infrared (IR) phonon properties of one-dimensional (1D) metallic peanut-shaped C60 polymers, which exhibit an energy gap below 60 K [Y. Toda etal, Appl. Phys. Lett. 92, 094102 (2008)] that is similar to the Peierls transition of quasi-1D metallic materials, have been examined in the temperature range of 30–300 K by high-resolution in-situ IR spectroscopy. We observed an IR phonon anomaly in which two new IR modes appear at 50 K and become increasingly anomalous with decreasing temperature in a similar manner as phase phonons associated with charge density waves in quasi-1D condensates.

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Applied Physics Letters  (Volume:97 ,  Issue: 24 )