DocumentCode
909712
Title
Flux Pinning Characteristics of 
Films With the Additional  nanorods within REBa<sub>2</sub>Cu<sub>3</sub>O<i>y</i> (REBCO) films are attractive as <i>c</i>-axis correlated pinning centers. On the other hand, we have fabricated high-J<sub>c</sub> Sm<sub>1+x</sub>Ba<sub>2-x</sub>Cu<sub>3</sub>O<sub>y</sub> (SmBCO) films including nanosized low-T<sub>c</sub> 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 <i>c</i>-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 <i>c</i>-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.</div></div>
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<div class='row g-0 align-items-center mb-2'><div class='col-12 col-md-3 fullRecLabelEnglish fw-bold mb-2 mb-md-0'><span class='text-muted small'>Keywords</span></div><div class='col-12 col-md-9 leftDirection leftAlign'>adsorbed layers; barium compounds; critical current density (superconductivity); crystal microstructure; flux pinning; high-temperature superconductors; nanostructured materials; nucleation; pulsed laser deposition; samarium compounds; self-assembly; superconducting thin films; surface diffusion; transmission electron microscopy; Sm<sub>1+x</sub>Ba<sub>2-x</sub>Cu<sub>3</sub>O<sub>y</sub>-BaZrO<sub>3</sub>; TEM; adatoms; c-axis correlated pinning centers; columnar defects; critical current density; cross-sectional transmission electron microscopy; lattice strain; low-temperature growth; magnetic flux pinning; microstructures; nucleation frequency; pulsed laser deposition; self-organized nanorods; superconducting films; surface diffusion length; <formula formulatype=)
${rm BaZrO}_{3}$ ; ${rm Sm}_{1+x}{rm Ba}_{2-x}{rm Cu}_{3}{rm O}_{y}$ ; pinning; self-organization;
fLanguage
English
Journal_Title
Applied Superconductivity, IEEE Transactions on
Publisher
ieee
ISSN
1051-8223
Type
jour
DOI
10.1109/TASC.2009.2018456
Filename
4967842
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