A close correlation between nanostructure formations and the thickness dependence of the critical current density in pure and BaSnO{sub 3}-added GdBa{sub 2}Cu{sub 3}O{sub 7-δ} films
- Department of Physics, Sungkyunkwan University, Suwon 440-746 (Korea, Republic of)
A close correlation between the nanostructure formations and the thickness dependence of the in-field critical current density (J{sub c}) in GdBa{sub 2}Cu{sub 3}O{sub 7-δ} (GdBCO) films is reported. Pure and 2 wt. % BaSnO{sub 3} (BSO)-added GdBCO films with film thicknesses (d) ranging from 0.2 μm to 1.5 μm were deposited on SrTiO{sub 3} single-crystalline substrates by using a pulsed laser deposition technique. Magnetization data measured at 77 K with the magnetic field applied parallel to the c-axis of the films showed the general trend of decreasing in-field J{sub c} with increasing residual film thickness. The two special inversions, however, were observed at d ∼ 0.6 μm, for which the J{sub c}’s of both the pure and BSO-added GdBCO films were larger than those of the films with d ∼ 0.4 μm. A sequential ion-milling process and scanning electron microscopy studies were employed to examine the microstructural evolution in the 1.5- μm-thick GdBCO films. For the pure GdBCO films, nanosized dislocations were observed to start growing at intersections of perpendicularly connected a-axis-oriented grains in a residual film thickness (t) of ∼ 0.6 μm and the growth persisted to the top surface of the 1.5-μm-thick GdBCO film. For the BSO-added GdBCO films, the density of BSO nanorods was estimated to be decreased versus t with an increase found at t of ∼ 0.6 μm A reason for this inversions of J{sub c} might be the nanostructure formations at t ∼ 0.6 μm, which were proved to serve as effective pinning centers.
- OSTI ID:
- 22275585
- Journal Information:
- Journal of Applied Physics, Vol. 115, Issue 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Similar Records
Rapid Epitaxial Growth of GdBa{sub 2}Cu{sub 3}O{sub 7-σ} Films by Dilute Co Doping
Growth and structural analysis of GdBa sub 2 Cu sub 3 O sub 7 superconducting thin films on MgO single-crystal substrates
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
BARIUM COMPOUNDS
CORRELATIONS
CRITICAL CURRENT
CUPRATES
CURRENT DENSITY
DISLOCATIONS
ENERGY BEAM DEPOSITION
GADOLINIUM COMPOUNDS
HIGH-TC SUPERCONDUCTORS
LASER RADIATION
MAGNETIC FIELDS
MAGNETIZATION
MICROSTRUCTURE
MONOCRYSTALS
NANOSTRUCTURES
PULSED IRRADIATION
SCANNING ELECTRON MICROSCOPY
STANNATES
STRONTIUM TITANATES
SUPERCONDUCTING FILMS
THICKNESS