Anomalous infrared spectra of hybridized phonons in type-I clathrate Ba${}_8$Ga${}_{16}$Ge${}_{30}$

K. Iwamoto, S. Kushibiki, H. Honda +7

The optical conductivity spectra of the rattling phonons in the clathrate Ba${}_8$Ga${}_{16}$Ge${}_{30}$ are investigated in detail by use of the terahertz time-domain spectroscopy. The…