earticle

영어

For many large-scale applications of high-temperature superconducting materials, large critical current density(Jc) in high applied magnetic fields are required. A number of methods have been reported to introduce artificial pinning centers(APCs) in YBa2Cu3O7-δ(YBCO) films for enhancement of their Jc. In this work, we investigated electric characteristic of YBCO films on SrTiO3 (100) substrates whose surfaces were modified by the introduction of Au nanoparticles (AuNPs). Au nanoparticles were uniformly dispersed on STO substrates with one of typical solution techniques, self assembled monolayer. After heating the STO substrates with Au nanoparticles, the size of Au nanoparticles was around 29~32 nm in height and 41~49 nm in diameter. XRD diffraction patterns taken on the YBCO film with Au nanoparticles show the c-axis orientation. The measured Tc of YBCO /AuNPs films was around 89K and the Jc was 0.75 MA/cm2 at 65 K and 1 T.