Near Infrared Reflectivity of Graphite under Hydrostatic Pressure. I. Experiment

概要

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We report here the dependence on hydrostatic pressure up to 2.79 kbars ofthe two structures associated with the A. and A. transitions in the reflectivityspectra of graphite measured at room temperature in the photon energy rangefrom 0.655 to 1.125 eV. By considering explicitly the effect of the trigonal warpingupon the probabilities of these transitions, their spectral shapes are shown to bea step and a peak, respectively, resulting in new locations of critical points on thespectral features A. and A. which are different from those previously givenby Bcllodi et al. The observed shifts of these structures due to pressure providethe first direct experimental determination of the fractional change per unitpressure increment of the Slonczewski-Weiss-McCIure band parameters 7. and7, yielding values of 8 In y./2p=0.028f0.003 (kbar) ' and 8 In 7./27>=0.055f0.016 (kbar) '
社団法人日本物理学会の論文
1979-07-15