Tuesday, 08/19/08

Session Title:	Flux Pinning and Dynamics II - Engineered Pinning Arrangements
Session Chairs:	Paul Barnes, Air Force Research Laboratory, Wright-Patterson AFB & Takanobu Kiss, Kyushu University
Paper Number:	2MPD08
Start Time:	10:00am
Session Type:	Poster

Flux pinning characteristics of Sm1+xBa2-xCu3Oy films with the additional c-axis correlated pinning centers T. Ozaki, Y. Yoshida, Y. Ichino, T. Harada, Y. Takai, Department of Electrical Engineer and Computer Science, Nagoya University; K. Matsumoto, Kyushu Institute of Technology; A. Ichinose, S. Horii, Central Research Institute of Electric Power Industry; M. Mukaida, Kyushu University; R. Kita, Shizuoka University

We have fabricated high-Jc Sm1+xBa2-xCu3Oy (SmBCO) films including nanosized low-Tc phases within the high-Tc matrix by using a low-temperature growth (LTG) technique. On the other hand, it is known that the BaZrO3 (BZO) nanorods grown in the REBCO films are enough effective as the c-axis correlated pinning centers. In this study, we incorporated BZO nanorods into the LTG-SmBCO film for further enhancement of the flux pinning. As can be concluded from our experimental results such as TEM images, irreversibility line and field angular dependence of Jc, the LTG-SmBCO+BZO film included the low-Tc phases and slightly tilted columns against c-axis comprised of BZO. Unfortunately, Tc’s of the LTG-SmBCO film and the LTG-SmBCO+BZO film were 92.5 K and 89.8 K, respectively. From the more recent research it is revealed that Tc of BaSnO3 (BSO) doped REBCO (RE = Y, Eu) films is less sensitive for the BSO content and the films have similar columnar defects with BZO doping. With these facts, we investigated the influences of the doped BSO in the SmBCO films on microstructure and superconducting properties.

This work has been supported by CREST of JST and Grant-in-Aid for Scientific Research (19676005).