OPTICAL AND ELECTRICAL INVESTIGATIONS OF PRXY1-XBA2CU3O7-DELTA SINGLE-CRYSTALS

Single crystals of the system Pr/Y-Ba-Cu-O were prepared with a self-f lux method in various compositions of PrxY1-xBa2Cu3O7-delta (with 0<x< 1).The chemical composition was determined by energy dispersive X-ray analysis in an electron microscope. The temperature dependence of the anisotropic electrical resistivity was determined from resistance meas urements with the method of Montgomery. The activated transport behavi our of the substituted crystals is discussed. The room temperature ref lectivity of the crystals in different crystallographic directions was measured in an IR-microscope. The energy dependence of the optical co nstants was calculated from the reflectivity curves with the Kramers-K ronig method.