Gap Reduction of C60 and C70 at High Pressure |
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| Authors: | K P Meletov V K Dolganov Yu A Ossipyan |
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| Institution: | Institute of Solid State Physics, Russian Academy of Sciences , Chernogolovka, Moscow distr. , 142432 , Russia |
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| Abstract: | Abstract The absorption spectra of the C60 and C70 are measured at pressures up to 19 GPa. The pressure dependence of the fundamental absorption edge position E(P) is determined for both materials. The initial value of dE/dP=?0.15 eV/GPa for the stronger-absorption region of C60 decreases up to ?0.019 eV/GPa at 12 GPa. The weaker-absorption region located near the fundamental absorption edge shifts slower dE/dP=?0.05 eV/GPa. For the C70 the initial value of dE/dP=?0.1 eV/GPa decreases up to ?0.029 eV/GPa at 10 GPa. All pressure induced changes are reversible in this pressure range. |
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