Effects of indium doping on the superconducting properties of YBa2Cu3Oy sintered compounds and thin films

Abstract We investigated the effects of indium doping on the superconducting properties of YBCO sintered samples and thin films. In 2 O 3 -doped YBCO and YBa 2 Cu 3− x In x O y sintered samples showed a gradual decrease in the critical temperature ( T c ) with increasing indium content; however, a T c value above 80 K was maintained even up to 30 vol.% addition and x  = 0.4, respectively. Ba 3 Cu 3 In 4 O 12 was detected by X-ray diffractometry and energy-dispersive X-ray spectroscopy as a reaction product for both sintered samples. The normalized J c under a magnetic field of 0.1 T showed a maximum at x  = 0.3. Indium-doped YBCO films prepared by pulsed laser deposition showed a similar dependence of T c on indium content as the sintered samples.