Optical investigation of high critical-current Gd₁+xBa₂-xCu₃O7 coated conductors

초록

Gd₁+xBa₂-xCu₃O7 (GdBCO) coated conductors on IBAD-MgO templates have grown by pulsed laser deposition. Critical current of the films were measured as about 90 A/cm by a four-probe method. The optical response of the films was investigated by Raman scattering spectroscopy. According to the Raman scattering spectra, the peaks at 328 cm-¹, 451 cm-¹, 504 cm-1 were found and assigned to one B1g mode and two A1g modes, respectively. The high critical-current carrying behaviors of the GdBCO coated conductors are ascribed to their 123-structure without exchange of cation and incorporation of oxygen into the cuprates.