Volume 57, Number 2, January 2002
|Page(s)||281 - 287|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Generation of the low-density liquid phase of carbon by non-thermal melting of fullerite
Institut für Laser- und Plasmaphysik, Universität Essen -
2 Materials Sciences Division, Lawrence Berkeley National Laboratory - USA
3 INFM and Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca Via Cozzi 53, I-20125 Milano, Italy
4 INFM and Dipartimento di Fisica, Università di Milano Via Celoria 16, 20133 Milano, Italy
Accepted: 25 October 2001
By using femtosecond laser excitation, non-thermal melting of fullerite has been experimentally achieved. Because the ultrafast, non-thermal transition occurs approximately at constant volume, the density of the resulting liquid is 25% lower than for non-thermally molten graphite. Tight-binding molecular-dynamics simulations indicate the formation of the low-density liquid phase, composed by sp-bonded chains at 7900 and 7. The extracted dc resistivity of the liquid (2) is in agreement with theoretical predictions (2.5) for the equilibrium low-density phase.
PACS: 78.47.+p – Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter / 81.05.Uw – Carbon, diamond, graphite / 71.15.Pd – Molecular dynamics calculations (Car-Parrinello) and other numerical simulations
© EDP Sciences, 2002
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