TY - JOUR
T1 - Flux pinning characteristics of Smi+xBa2-xCu 3Oy films with the additional c-axis correlated pinning centers
AU - Ozaki, Toshinori
AU - Yoshida, Yutaka
AU - Ichino, Yusuke
AU - Harada, Takahiro
AU - Takai, Yoshiaki
AU - Matsumoto, Kaname
AU - Ichinose, Ataru
AU - Horii, Shigeru
AU - Mukaida, Masashi
AU - Kita, Ryusuke
N1 - Funding Information:
Manuscript received August 25, 2008. First published date May 26, 2009; current version published July 15, 2009. This work was supported in part by a Grant-in-Aid for Scientific Research (19676005 and 20686065). Part of the work was supported by Japan Society for the Promotion of Science (20-1311).
PY - 2009/6
Y1 - 2009/6
N2 - It is known that columnar defects comprised of self-organized BaZrO 3 (BZO) nanorods within REBa2Cu3Oy (REBCO) films are attractive as c-axis correlated pinning centers. On the other hand, we have fabricated high-Jc Sm1+xBa 2-aCu3Oy (SmBCO) films including nanosized low-Tc phases by using the low-temperature growth (LTG) technique. In this study, BZO nanorods were added to the LTG-SmBCO film for a further enhancement of the magnetic flux pinning. Additionally, we also deposited a conventional PLD-SmBCO film including BZO nanorods and discussed differences of the flux pinning properties and microstructures between LTG- and PLD-SmBCO films. In a cross-sectional transmission electron microscopy (TEM) image of the BZO doped PLD-SmBCO film, we could see the self-organized BZO nanorods were about 10 nm in diameter, extending along the c-axis of the film. In contrast, in the BZO doped LTG-SmBCO film, the high density BZO nanorods with smaller diameters tended to be short columns and tilted against the c-axis direction. These facts can be attributed to a suppression of the surface diffusion length of adatoms and/or an increase of nucleation frequency due to the low substrate temperature during the growth of the BZO doped LTG-SmBCO film. Furthermore, we concluded that differences of superconducting properties between the BZO doped PLD- and LTG-SmBCO films might be attributed to the difference in the number density of BZO nanorods which generated lattice strain around them.
AB - It is known that columnar defects comprised of self-organized BaZrO 3 (BZO) nanorods within REBa2Cu3Oy (REBCO) films are attractive as c-axis correlated pinning centers. On the other hand, we have fabricated high-Jc Sm1+xBa 2-aCu3Oy (SmBCO) films including nanosized low-Tc phases by using the low-temperature growth (LTG) technique. In this study, BZO nanorods were added to the LTG-SmBCO film for a further enhancement of the magnetic flux pinning. Additionally, we also deposited a conventional PLD-SmBCO film including BZO nanorods and discussed differences of the flux pinning properties and microstructures between LTG- and PLD-SmBCO films. In a cross-sectional transmission electron microscopy (TEM) image of the BZO doped PLD-SmBCO film, we could see the self-organized BZO nanorods were about 10 nm in diameter, extending along the c-axis of the film. In contrast, in the BZO doped LTG-SmBCO film, the high density BZO nanorods with smaller diameters tended to be short columns and tilted against the c-axis direction. These facts can be attributed to a suppression of the surface diffusion length of adatoms and/or an increase of nucleation frequency due to the low substrate temperature during the growth of the BZO doped LTG-SmBCO film. Furthermore, we concluded that differences of superconducting properties between the BZO doped PLD- and LTG-SmBCO films might be attributed to the difference in the number density of BZO nanorods which generated lattice strain around them.
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U2 - 10.1109/TASC.2009.2018456
DO - 10.1109/TASC.2009.2018456
M3 - Article
AN - SCOPUS:68649092504
VL - 19
SP - 3507
EP - 3510
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 3
M1 - 4967842
ER -