Photonic crystals in biology

Poster Session, Tuesday, June 15
Theme A1 - B702
Nanoparticle Doped YBCO Films Prepared by Chemical Solution Deposition Method
Isil Birlik, 1* Erdal Celik 1 and Bernhard Holzapfel 2
1 Department of Metallurgy and Materials Engineering, Dokuz Eylül University, Izmir, 35160, Turkey
2 Leibniz Institute for Solid State and Materials Research, Institute for Metallic Materials, Helmholtzstrasse 20, D-01069, Dresden, Germany
Abstract— In the present work, a study of introducing BaZrO 3 nanoparticles inside the YBCO matrix as artificially pinning
centers by chemical solution deposition method is presented. YBCO films with Zr doping have been prepared by the
trifluoroacetate metal-organic deposition (TFA-MOD) method through acetate based precursor chemical powders
and dissolving different amounts of Zr (IV)-penthanedionate into the precursor solution. Three different doped
solutions were prepared with 6, 12 and 18 mol% BaZrO 3. These results prove this method is a promising technique
for the nanostructuration of coated conductors.
Chemical solution deposition methodologies have shown to
be a low-cost way to the production of coated conductors and
the most promising method for large scale applications. The
performance of YBCO thin films especially for power
applications are controlled by their critical current density
under magnetic field conditions. They need to carry a high
critical current density under high magnetic fields. An increase
in coated conductor performance can be achieved by pinning
of the quantized flux lines by nanoscale crystalline defects and
impurities[1, 2]. The way for flux pinning in the YBCO
structure can be the use of nanoparticles-modified substrate
surfaces, mixing rare earth doping and introducing nano-sized
BaMeO 3 particles in to the structure as artificial pinning
centers. Among these approaches, BaZrO 3 (BZO)
nanoparticles in YBCO thin films are one of the most popular
ones which can prevent the vortex motion at high fields. The
amount of dopant in the structure needs to be high enough to
generate the density of defects, which is needed to enhance
flux pinning in magnetic fields. However, excess amounts of
this nonsuperconducting content can suppress the self-field and
in-field J c values significantly [3].
and and scans were collected to determine the out-of-plane
and in-plane alignments of the films respectively. Size of the
BZO nanoparticles were estimated with the Scherrer formula.
Surface morphology of films was observed by Scanning
Electron Microscope (SEM) as shown in Figure 1. The critical
transition temperature (T c ) and critical current density (J c ) of
the films were measured by an inductive method. Transport
measurements up to 6 T at 77 K on bridges of 0.8 mm length
and 50 m width were carried out with a physical properties
measurement system (PPMS).
As a result, we showed that chemical solution deposition
method lead to a significant improvement of pinning properties
of the YBCO films suggesting that artificial pinning centers
successfully generated. These results prove this method is a
promising technique for the nanostructuration of coated
conductors.
This work was funded by the EU-FP6 Research Project
”NanoEngineered Superconductors for Power Applications“
NESPA no. MRTN-CT-2006-035619.
*Corresponding author: isil.kayatekin@deu.edu.tr
[1] Strickland N M, Long N J, Talantsev E F, Hoefakker P, Xia J, Rupich M
W, Kodenkandath T, Zhang W, Li X, Huang Y 2008 Physica C 468 183-189
[2] Engel S, Thersleff T, Hühne R, Schultz L and Holzapfel B 2007 Applied
Physics Letters 90
[3] Chen Y, Selvamanickam V, Zhang Y, Zuev Y, Cantoni C, Specht E,
Paranthaman M P, Aytug T, Goyal A and Lee D 2009 Applied Physics Letters
94
Figure 1: Surface morphologies of (a) pure and (b) 6 mol% BZO doped
YBCO film.
YBCO films with Zr doping have been prepared by the
trifluoroacetate metal-organic deposition (TFA-MOD) method
through acetate based precursor chemical powders and
dissolving different amounts of Zr (IV)-penthanedionate into
the precursor solution. Three different doped solutions were
prepared with 6, 12 and 18 mol% BaZrO 3 . Film deposition on
10 mm x 10 mm STO (100) single crystal substrate was
performed by spin coating technique. We tried to show how
nanoparticles density can be finely tuned through the control of
dopant concentration. Spin coated samples were heat treated.
X-Ray Diffraction (XRD) was carried out using a Philips
diffractometer with Co K radiation to ascertain the phase
purity of the undoped and doped films. BZO nanoparticles
were detected in the doped YBCO films by x-ray diffraction
6th Nanoscience and Nanotechnology Conference, zmir, 2010 221