Insulator-metal transition in PrYCaCoO3 thin films studied by terahertz and infrared spectroscopies

Charge transport in PrYCaCoO 3 thin films was studied experimentally by terahertz (THz) and infrared spectroscopies and by dc conductivity measurements. The metal-insulator transition is clearly visible in THz conductivity, whereas the observed weak temperature dependence of dc conductivity is limited by inter-grain charge transport.