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

• Published in: Physica. C, Superconductivity Superconductivity, 2010-11, Vol.470 (20), p.1198-1200
• Main Authors: Kita, R., Nakamura, S., Sakimoto, K., Nakamura, T., Miura, O., Matsumoto, K., Mele, P., Yamada, K., Kaneko, K., Ichinose, A.
• Format: Article
• Language: English
• Subjects: Artificial pinning center; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical currents; Effects of material synthesis, crystal structure, and chemical composition; Exact sciences and technology; High-tc films; In-doping; In2O3; Physics; Properties of type I and type II superconductors; Superconducting films and low-dimensional structures; Superconductivity; Thin film; Transition temperature variations
• ISSN: 0921-4534; 1873-2143
• DOI: 10.1016/j.physc.2010.05.073

We investigated the effects of indium doping on the superconducting properties of YBCO sintered samples and thin films. In2O3-doped YBCO and YBa2Cu3−xInxOy sintered samples showed a gradual decrease in the critical temperature (Tc) with increasing indium content; however, a Tc value above 80K was maintained even up to 30vol.% addition and x=0.4, respectively. Ba3Cu3In4O12 was detected by X-ray diffractometry and energy-dispersive X-ray spectroscopy as a reaction product for both sintered samples. The normalized Jc under a magnetic field of 0.1T showed a maximum at x=0.3. Indium-doped YBCO films prepared by pulsed laser deposition showed a similar dependence of Tc on indium content as the sintered samples.