Abstract
DyBa2(Cu 1−x-Zrx )3 O 7−δ
thin films (with x = 0.00, 0.02, 0.04, and 0.06) were synthetized
using the chemical solution deposition method on single crystalline
LaAlO3
substrates. Effects resulting from Zr doping were investigated by means
of magnetic and structural measurements. X-ray diffraction analysis
demonstrated a strong c-axis orientation in the DyBa 2(Cu1−x -Zrx) 3 O 7−δ thin films, with only minor reflections due to the presence of Dy2 O 3 and BaZrO3 phases. Narrow transitions with Δ Tc
ranging from 1 to 2 K for samples with x = 0.00 and 0.06,
respectively, were observed in ac magnetic susceptibility curves, where
the nondoped sample demonstrated the highest T onsetc of 91.7 K compared to the Zr-doped samples. Critical current densities Jc
of the thin films were obtained from magnetization loop measurements
with applied magnetic fields up to 6 T and by employing the Bean model.
The sampled doped with 4% Zr exhibited the highest J c value (J c = 3.5 MA/cm 2,
self-field, 77 K) in the low field range and we, in general, observed
that Zr-doped films demonstrated higher values compared to the pure
sample. Pinning force plots ( Fp
versus B ) reveal a significant improvement over the magnetic field
range investigated of the maximum pinning force for Zr-doped samples. We
found FMaxp = 1.7 GN/m3 and 3.8 GN/m 3
for pure and 6% Zr samples, respectively. Analysis based on the
Dew-Hughes model shows that normal surface pinning is the dominating
pinning mechanism.
Original language | English |
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Article number | 8000804 |
Journal | I E E E Transactions on Applied Superconductivity |
Volume | 28 |
Issue number | 4 |
Number of pages | 4 |
ISSN | 1051-8223 |
DOIs | |
Publication status | Published - 2018 |
Keywords
- Superconducting
- thin film
- Zr-doping
- critical current density