Structural transitions of SWNT filled with C60 under high pressure
Zou Yong-gang1, Xu Li1, †, , Tian Kun1, Zhang He1, Ma Xiao-hui1, Yao Ming-guang2
       

(a) Pressure dependence of RBM frequency (initial frequency−1) and (b) FWHM of RBMs of peapod sample. Excitation wavelength is 830 nm.