HIGH Tc SUPERCONDUCTING THIN FILMS BY CHEMICAL SPRAY DEPOSITION

1987 ◽  
Vol 01 (02) ◽  
pp. 579-582
Author(s):  
Guang-yao Meng ◽  
Xian-dong Wang ◽  
Xue-jun Chen ◽  
Pei-zhen Fu ◽  
Pinghua Yang ◽  
...  
Keyword(s):  
Thin Films ◽  
Spray Deposition ◽  
Nitrate Solution ◽  
Deposition Process ◽  
Superconducting Thin Films ◽  
High Tc ◽  
Chemical Spray ◽  
Zero Resistance ◽  
Super Conducting ◽  
Deposition Conditions

A Chemical spray deposition process with mixed nitrate solution as source was developed to prepare thin films of Ba-Y-Cu oxide on sapphire substrate. By adjusting the source composition and deposition conditions, we have successfully obtained the films in thickness of 2–15μm with essentially orthorhombic Ba2YCu3O7 phase. The films behave super conducting transition with onset above 90K and zero resistance at 68.4K to date. It is believed that the tails in the resistance transition can be improved by searching proper heat treatment and using suitable substrates such as ZrO2 and SrTiO3.

As-deposited near-single crystalline high Tc and Jc superconducting thin films by a pulsed lased deposition process

1989 ◽  
Vol 32-33 ◽  
pp. 1043-1050 ◽  
Author(s):  
T VENKATESAN ◽  
P ENGLAND ◽  
P MICELI ◽  
E CHASE ◽  
C CHANG ◽  
...  
Keyword(s):  
Thin Films ◽  
Deposition Process ◽  
Superconducting Thin Films ◽  
High Tc ◽  
Single Crystalline

Substrate bias effects during R-F sputtering of Y-Ba-Cu-O films

1990 ◽  
Vol 5 (4) ◽  
pp. 677-679 ◽  
Author(s):  
A. J. Drehman ◽  
M. W. Dumais
Keyword(s):  
Thin Films ◽  
Strontium Titanate ◽  
Reactive Sputtering ◽  
Negative Bias ◽  
Superconducting Thin Films ◽  
Substrate Bias ◽  
Composition Control ◽  
Zero Resistance

Y-Ba-Cu-O films were made by R-F diode sputtering using a single oxide target. It was found that if a small negative bias is applied to the substrate, the etching associated with reactive sputtering is significantly reduced. This results in better composition control and uniformity, which are quite important for the formation of superconducting thin films. Films deposited on strontium titanate, when annealed in oxygen, become superconducting with zero resistance at 89 K.

X-Ray Diffraction Analysis of High Tc Superconducting Thin Films

1989 ◽  
pp. 269-278
Author(s):  
T. C. Huang ◽  
A. Segmüller ◽  
W. Lee ◽  
V. Lee ◽  
D. Bullock ◽  
...  
Keyword(s):  
Thin Films ◽  
Diffraction Analysis ◽  
Superconducting Thin Films ◽  
X Ray Diffraction ◽  
High Tc ◽  
X Ray

IN-SITU PREPARATION OF YBa2Cu3O7 SUPERCONDUCTING THIN FILMS BY PULSED Nd:YAG LASER DEPOSITION

1992 ◽  
Vol 06 (08) ◽  
pp. 477-483 ◽  
Author(s):  
QINGXIN SU ◽  
SHIFA XU ◽  
DAFU CUI ◽  
HUIBIN LU ◽  
YONGJUN TIAN ◽  
...  
Keyword(s):  
Thin Films ◽  
Substrate Temperature ◽  
Nd:Yag Laser ◽  
Ac Susceptibility ◽  
Substrate Surface ◽  
Zero Magnetic Field ◽  
Superconducting Thin Films ◽  
In Situ Preparation ◽  
Zero Resistance

High-T c superconducting thin films of YBa 2 Cu 3 O 7 were grown in-situ on (100) SrTiO 3 substrates by Nedymium:yttrium aluminum garnet [Nd:YAG] laser ablation. The effects of the substrate temperature on the transition temperature, microcrystalline structure and surface morphology of the films were discussed. Best results were obtained in the 730°–770°C range. X-ray diffraction analysis showed that these films were highly c-oriented with the c-axis perpendicular to the substrate surface. At the optimum substrate temperature, a very smooth morphology with only a few small particles were observed by scanning electron microscopy. The zero resistance temperature of these films were ≥ 90 K with a narrow transition width and the ac susceptibility measurement also gave the same result. The highest critical current density obtained at 77 K and zero magnetic field was 3.8 × 106 A/cm 2.

PLASMA OXIDATION OF HIGH Tc SUPERCONDUCTING THIN FILMS

1989 ◽  
pp. 257-262
Author(s):  
H.-U. HABERMEIER ◽  
W. EBERT ◽  
S. KALT ◽  
G. WAGNER ◽  
G. MERTENS
Keyword(s):  
Thin Films ◽  
Superconducting Thin Films ◽  
Plasma Oxidation ◽  
High Tc
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