Features of the optical absorption of crystals of the fullerene C60 in the region of the orientational phase transition |
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Authors: | A N Izotov V V Kveder Yu A Osip’yan É A Steinman R K Nikolaev N S Sidorov |
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Institution: | (1) Institute of Solid-State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russia |
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Abstract: | The absorption coefficient of perfect single crystals of the fullerene C60 is measured in the energy range 1.6–2.1 eV at temperatures from 4.2 to 300 K. An absorption fine structure is discovered
in the and is assigned to electronic and vibronic transitions with the production of free excitons and excitons localized
on structural defects. It is shown that in the region of the structural phase transition from a face-centered cubic structure
to a simple cubic structure the absorption coefficient undergoes a jump, which is associated with an energy shift of the free
exciton line toward lower energies. It is discovered that spatial inhomogeneity, which is associated with the growth of the
new phase from a finite number of nuclei, appears in the crystal at the time of this transition.
Zh. éksp. Teor. Fiz. 114, 2211–2224 (December 1998) |
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