In-Situ Preparation of High-Tc Thin Films by Co-Evaporation Using Ozone Vapor Oxidation

1991 ◽  
pp. 863-868
Author(s):  
D. D. Berkley
Keyword(s):  
Thin Films ◽  
High Tc ◽  
In Situ Preparation

In situ preparation of epitaxial TlBa2Ca2Cu3O9 high‐Tc thin films

1996 ◽  
Vol 68 (7) ◽  
pp. 1000-1002 ◽  
Author(s):  
N. Reschauer ◽  
U. Spreitzer ◽  
W. Brozio ◽  
A. Piehler ◽  
K. F. Renk ◽  
...  
Keyword(s):  
Thin Films ◽  
High Tc ◽  
In Situ Preparation

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.

On detection of the Fermi edge in in situ grown thin films of high-Tc oxides

2001 ◽  
Vol 364-365 ◽  
pp. 538-540 ◽  
Author(s):  
M Abrecht ◽  
D Ariosa ◽  
S.A Saleh ◽  
S Rast ◽  
G Margaritondo ◽  
...  
Keyword(s):  
Thin Films ◽  
High Tc ◽  
Fermi Edge

Comparison of Several CU(I) and CU(II) Precursors for the Sol-Gel Preparation of High TC Superconducting Metal Oxides

1988 ◽  
Vol 121 ◽  
Author(s):  
Mariquita A. Accibal ◽  
Jonathan W. Draxton ◽  
Allen H. Gabor ◽  
Wayne L. Gladfelter ◽  
Beth Anne Hassler ◽  
...  
Keyword(s):  
Thin Films ◽  
Metal Oxides ◽  
Coordination Compounds ◽  
Sol Gel ◽  
High Tc ◽  
Superconducting Metal ◽  
Zero Resistance ◽  
Gel Preparation ◽  
Sol Gel Synthesis

ABSTRACTA comparison of the use of three different coordination compounds of copper as precursors for the sol-gel synthesis of YBa2Cu3O7-δ has been made. For yttrium, the tris(isopropoxide) was used exclusively, while the use of both Ba(O-i-Pr)2 and Ba(OCH2CH2OEt)2 (prepared in situ from Ba metal) as sources for Ba were studied. After dissolving Y(O-i-pr)3, a Ba source, and the copper(I) alkoxide, [Cu(O-i-Bu)]4, hydrolysis led immediately to an orange gelatinous solid which yielded YBa2Cu3O7-δ upon firing in oxygen. Copper(II) acetate was found to give heterogeneous mixtures under our conditions and was not further studied. Copper(II) acac (acac = acetylacetonate) yielded the best results. Partially hydrolyzed solutions of Cu(acac)2, Ba(OCH2CH2OEt)2, and Y(O-i-pr)3 were spin coated on SrTi03 (100) and fired under oxygen to give oriented (b axis normal to the surface) thin films of YBa2Cu3O7-δ. The onset of superconductivity for the films was 92 K, but they did not reach zero resistance until much lower temperatures.

The 'in-situ' preparation and properties of Y-Ba-Cu-O thin films on the SrTiO/sub 3/, Al/sub 2/O/sub 3/ and Si substrates

1991 ◽  
Vol 27 (2) ◽  
pp. 1475-1478 ◽  
Author(s):  
M.I. Faley ◽  
M.E. Gershenson ◽  
N.P. Kuchta ◽  
V.S. Salun
Keyword(s):  
Thin Films ◽  
Si Substrates ◽  
In Situ Preparation

In-Situ Preparation of Y-Ba-Cu-O Thin Films Using Mass-Spectrometer Rate Control and Atomic Oxygen

1992 ◽  
Vol 275 ◽  
Author(s):  
H. Ohlsén ◽  
M. Ottosson ◽  
J. Hudner ◽  
M. ÖStling ◽  
L. Stolt ◽  
...  
Keyword(s):  
Thin Films ◽  
Mass Spectrometer ◽  
Rate Control ◽  
Atomic Oxygen ◽  
Film Structure ◽  
Rocking Curve ◽  
In Situ Preparation ◽  
Layer Structures

ABSTRACTThin films of YBCO were prepared using a mass-spectrometer controlled coevapora-tion/MBE process with atomic oxygen. Under the conditions of low pressure, necessary for mass-spectrometer rate control, it is shown that an atomic oxygen beam source can be utilized in order to grow high quality thin films of YBCO as well as multi-layer structures involving YBCO and Y2O3. Values of Tc = 88.5 K and Jc = 6–106 A/cm2 at 77 K were determined for a strip with a width of 10 μm of YBCO deposited on a LaAlO3 substrate. Film structure is analyzed by XRD and rocking curve measurements. Magnetic characterization of films and multi-layer structures are reported.

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