High Tc superconducting thin films prepared by pulsed Nd:YAG laser ablation

1988 ◽  
Author(s):  
L. Lynds ◽  
B. R. Weinberger ◽  
T. W. Grudkowski
1989 ◽  
Vol 169 ◽  
Author(s):  
Tomoji Kawai ◽  
Masaki Kanai ◽  
Hitoshi Tabata ◽  
Shichio Kawai

AbstractBy using 1ayer-by-1ayer successive deposition method with excimer laser ablation, the distance between CuO2 planes in the Bi2Sr2Ca1Cu2Oy superconductor has been controlled and super lattices with concentration modulation of Y and Ca have been formed. From the properties of these ‘Tailored films’, it is suggested that there is an interaction between CuO2 layers across Ca layer to affect the Tc value, but there is a very weak interaction across Bi2O2 blocking layers.


1987 ◽  
Vol 99 ◽  
Author(s):  
B. Dam ◽  
T. S. Baller ◽  
G. N. A. Van Veen ◽  
H. A. M. Van Hal ◽  
J. W. C. De Vries ◽  
...  

ABSTRACTHigh Tc superconducting thin films were prepared by DC triode sputtering and laser ablation. With both deposition methods we were able to fabricate thin films on SrTiO3 which show an onset at Tcf=92 K. The superconductive transition is complete at Tcf=86 K. On other substrates like Al2O3, MgO and ZrO2 relatively poor results were obtained.


1989 ◽  
Vol 169 ◽  
Author(s):  
J. Levoska ◽  
J. Hagberg ◽  
P. Pusa ◽  
A. Uusimäki ◽  
S. Leppävuori

AbstractHigh To superconducting Bi-(Pb-)Sr-Ca-Cu-O thin films were ablated on MgO(l00) substrates at room temperature using a Nd:YAG laser at 1064 or 532 nm. The target materials had compositions near Bi2-xpbxSr2Ca2+yCu3+zOy (x<0.6, y,z<l) and their zero resistivity temperatures were 101 - 105 K. The amorphous films were crystallized either by annealing near 850°C or they were first melted and then annealed. The effects of laser ablation parameters and annealing conditions were investigated. The films were studied by XRD, SEM/EDS and resistivity measurements.The best films were annealed near 850 °C and they consisted mainly of the 2223 phase. These films had T9(midpoint) at 107 K and zero resistivity at 100 K. In the melt-treated films the amount of the 2223 phase as well as Tc was lower. The superconducting phases in the annealed films were strongly oriented with their c-axes perpendicular to the substrate surface.


1998 ◽  
Author(s):  
Ileana Apostol ◽  
Razvan Stoian ◽  
C. Luculescu ◽  
Razvan V. Dabu ◽  
Aurel Stratan ◽  
...  

2004 ◽  
Vol 39 (13) ◽  
pp. 2089-2101 ◽  
Author(s):  
L.C. Nistor ◽  
C. Ghica ◽  
V.S. Teodorescu ◽  
S.V. Nistor ◽  
M. Dinescu ◽  
...  

1989 ◽  
pp. 269-278
Author(s):  
T. C. Huang ◽  
A. Segmüller ◽  
W. Lee ◽  
V. Lee ◽  
D. Bullock ◽  
...  

1992 ◽  
Vol 06 (08) ◽  
pp. 477-483 ◽  
Author(s):  
QINGXIN SU ◽  
SHIFA XU ◽  
DAFU CUI ◽  
HUIBIN LU ◽  
YONGJUN TIAN ◽  
...  

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.


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