Reversible Pressure-Induced Amorphization in Solid C70 : Raman and Photoluminescence Study

Details Reversible Pressure-Induced Amorphization in Solid C70 : Raman and Photoluminescence Study Reversible Pressure-Induced Amorphization in Solid C70 : Raman and Photoluminescence Study

1994-11-29

arxiv.org/abs/cond-mat/9411120v1

Physics

Condensed Matter

To appear in Phys. Rev. Lett., 12 pages, RevTeX (preprint format), 3 figures available upon request

Scientific paper

10.1103/PhysRevLett.73.3411

We have studied single crystals of $C_{70}$ by Raman scattering and photoluminescence in the pressure range from 0 to 31.1 GPa. The Raman spectrum at 31.1 GPa shows only a broad band similar to that of the amorphous carbon without any trace of the Raman lines of $C_{70}$. After releasing the pressure from 31.1 GPa, the Raman and the photoluminescence spectra of the recovered sample are that of the starting $C_{70}$ crystal. These results indicate that the $C_{70}$ molecules are stable upto 31.1 GPa and the amorphous carbon high pressure phase is reversible, in sharp contrast to the results on solid $C_{60}$. A qualitative explaination is suggested in terms of inter- versus intra-molecular interactions.

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