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Optical conductivity s(w) of PrRu4P12 has been studied under high pressure to14 GPa, at low temperatures to 8 K, and at photon energies 12 meV-1.1 eV. Theenergy gap in s(w) at ambient pressure, caused by a metal-insulator transitiondue to an unconventional charge-density-wave formation at 63 K, is graduallyfilled in with increasing pressure to 10 GPa. At 14 GPa and below 30 K, s(w)exhibits a pronounced Drude-type component due to free carriers. This indicatesthat the initial insulating ground state at zero pressure has been turned intoa metallic one at 14 GPa. This is consistent with a previous resistivity studyunder pressure, where the resistivity rapidly decreased with cooling below 30 Kat 14 GPa. The evolution of electronic structure with pressure is discussed interms of the hybridization between the 4f and conduction electrons.

Pressure suppression of unconventional charge-density-wave state in PrRu4P12 studied by optical conductivity