Abstract
It is known that columnar defects comprised of self-organized BaZrO 3 (BZO) nanorods within REBa 2 Cu 3 O y (REBCO) films are attractive as c-axis correlated pinning centers. On the other hand, we have fabricated high-J c Sm 1+x Ba 2-a Cu 3 O y (SmBCO) films including nanosized low-T c 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.
| Original language | English |
|---|---|
| Article number | 4967842 |
| Pages (from-to) | 3507-3510 |
| Number of pages | 4 |
| Journal | IEEE Transactions on Applied Superconductivity |
| Volume | 19 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Jun 1 2009 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering
Cite this
Flux pinning characteristics of Smi+ x Ba 2-x Cu 3 O y films with the additional c-axis correlated pinning centers . / Ozaki, Toshinori; Yoshida, Yutaka; Ichino, Yusuke; Harada, Takahiro; Takai, Yoshiaki; Matsumoto, Kaname; Ichinose, Ataru; Horii, Shigeru; Mukaida, Masashi; Kita, Ryusuke.
In: IEEE Transactions on Applied Superconductivity, Vol. 19, No. 3, 4967842, 01.06.2009, p. 3507-3510.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Flux pinning characteristics of Smi+ x Ba 2-x Cu 3 O y 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
PY - 2009/6/1
Y1 - 2009/6/1
N2 - It is known that columnar defects comprised of self-organized BaZrO 3 (BZO) nanorods within REBa 2 Cu 3 O y (REBCO) films are attractive as c-axis correlated pinning centers. On the other hand, we have fabricated high-J c Sm 1+x Ba 2-a Cu 3 O y (SmBCO) films including nanosized low-T c 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 REBa 2 Cu 3 O y (REBCO) films are attractive as c-axis correlated pinning centers. On the other hand, we have fabricated high-J c Sm 1+x Ba 2-a Cu 3 O y (SmBCO) films including nanosized low-T c 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.
UR - http://www.scopus.com/inward/record.url?scp=68649092504&partnerID=8YFLogxK
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U2 - 10.1109/TASC.2009.2018456
DO - 10.1109/TASC.2009.2018456
M3 - Article
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 -