Flux pinning characteristics of Sn-doped YBCO film by the MOD process

• Published in: Physica. C, Superconductivity Superconductivity, 2013-02, Vol.485, p.154-159
• Main Authors: Choi, S.M., Shin, G.M., Yoo, S.I.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical current density; Critical currents; Effective flux pinning centers; Exact sciences and technology; Metal-organic deposition (MOD); Physics; Properties of type I and type II superconductors; Sn-doped YBCO film; Superconductivity; Vortex lattices ,flux pinning, flux creep; YBa2SnO5.5 (YBSO)
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2012.12.007

► The pinning effects of undoped and Sn-doped YBCO films by MOD were characterized. ► Sn-containing nanoparticles were trapped in Sn-doped YBCO films by MOD. ► Sn-containing nanoparticles were identified as the YBa2SnO5.5 (YBSO) phase by TEM. ► The YBSO nanoparticles are responsible for improved flux pinning effect. ► We report the orientation relationship between YBSO nanoparticles and YBCO matrix. Compared with the undoped YBa2Cu3O7−δ (YBCO) film, 10mol% Sn-doped YBCO film exhibited significantly enhanced critical current densities (Jc) in magnetic fields up to 5T at 65 and 77K for H//c, indicating that the Sn-doped YBCO film possesses more effective flux pinning centers. Both samples were grown on the SrTiO3 (STO) (100) single crystal substrates by the metal-organic deposition (MOD) process. Larger Jc (77K, 1T) values of Sn-doped YBCO film are observed over a wide field-orientation angle (θ) except the field-orientations close to the ab-plane of YBCO (85°