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(Color online) (a) Typical Raman spectra taken from a pristine area and a residual indentation in single-crystal . (b) The corresponding high-frequency Raman bands deconvoluted by using Gaussian lines. The inset in (a) is a Raman map at , showing the distribution of within a residual indentation.
(Color online) Low-temperature Raman spectra of measured from to room temperature.
(Color online) Raman band shifts vs temperatures from . (a) Residual crystalline phase peaks and (b) peaks.
(Color online) (a) Raman spectra of measured from room temperature to . The room-temperature spectrum obtained from the pristine crystal is listed as reference. (b) The temperature dependences of the integrated area ratio of the and bands, and the estimated sizes of carbon clusters.
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