Gap reduction and the collapse of solid C60 to a new phase of carbon under pressure

Fred Moshary, Nancy H. Chen, Isaac F. Silvera, Charles A. Brown, Harry C. Dorn, Mattanjah S. de Vries, and Donald S. Bethune
Phys. Rev. Lett. 69, 466 – Published 20 July 1992
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Abstract

We have studied solid C60, measuring the shift of the optical absorption edge with pressure to 35 GPa. In the range of 0–17 GPa, extrapolation of the absorption edge indicates that metallization should occur by 33 GPa. However, from 17 to 25 GPa an irreversible transition to a ‘‘transparent phase’’ occurs. Raman scattering of the depressurized sample shows no trace of C60, diamond, or graphite, indicating that the transition involves the collapse of the C60 molcules into a new structure of carbon.

  • Received 23 December 1991

DOI:https://doi.org/10.1103/PhysRevLett.69.466

©1992 American Physical Society

Authors & Affiliations

Fred Moshary, Nancy H. Chen, and Isaac F. Silvera

  • Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138

Charles A. Brown, Harry C. Dorn, Mattanjah S. de Vries, and Donald S. Bethune

  • IBM Alamaden Research Center, 650 Harry Road, San Jose, California 95129-6099

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Vol. 69, Iss. 3 — 20 July 1992

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