Tailored High-Tc Superconducting Thin Films Prepared by Layer-By-Layer Deposition with Excimer Laser

1989 ◽  
Vol 169 ◽  
Author(s):  
Tomoji Kawai ◽  
Masaki Kanai ◽  
Hitoshi Tabata ◽  
Shichio Kawai
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Weak Interaction ◽  
Superconducting Thin Films ◽  
Layer By Layer ◽  
Deposition Method ◽  
High Tc ◽  
Excimer Laser Ablation ◽  
Layer Deposition

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.

scholarly journals In situ growth of YBaCuO superconducting thin films by excimer laser ablation: influence of deposition and cooling parameters

1993 ◽  
Vol 69 (1-4) ◽  
pp. 335-339 ◽  
Author(s):  
C. Champeaux ◽  
P. Marchet ◽  
J. Aubreton ◽  
J.-P. Mercurio ◽  
A. Catherinot
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Superconducting Thin Films ◽  
In Situ Growth ◽  
Excimer Laser Ablation

scholarly journals Preparation and Properties of Superconducting thin Films by Excimer Laser Ablation

1990 ◽  
Vol 191 ◽  
Author(s):  
Michael E. Geusic ◽  
Alan F. Stewart ◽  
Larry R. Pederson ◽  
William J. Weber ◽  
Kenneth R. Marken ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Laser Energy ◽  
Substrate Surface ◽  
Xrd Analysis ◽  
Zero Field ◽  
Superconducting Transition ◽  
X Ray Diffraction ◽  
Excimer Laser Ablation

ABSTRACTExcimer laser ablation with an in situ heat treatment was used to prepare high quality superconducting YBa2Cu3O7−x thin films on (100)-SrTiO3 and (100)-LaAlO3 substrates. A pulsed excimer laser (XeCl; 308 nm) was used to ablate a rotating, bulk YBa2Cu3O7−x target at a laser energy density of 2–3 J/cm2. Based on four-probe dc resistance measurements, the films exhibited superconducting transition temperatures (Tc, midpoint) of 88 and 87K with 2K (90–10%) transition widths for SrTiO3 and LaAlO3, respectively. Transport critical current densities (Jc) measured at 77K were 2 × 106 and 1 × 106 A/cm2 in zero field for SrTiO3 and LaAlO3, respectively. X-ray diffraction (XRD) analysis showed the films to be highly oriented, with the c-axis perpendicular to the substrate surface.

Growth and study of SrBi2 (Ta, Nb)2 O9 thin films by pulsed excimer laser ablation

2000 ◽  
Vol 114 (11) ◽  
pp. 585-588 ◽  
Author(s):  
S Bhattacharyya ◽  
S.S.N Bharadwaja ◽  
S.B Krupanidhi
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Excimer Laser Ablation

Characterization of C-N thin films deposited by reactive excimer laser ablation of graphite targets in nitrogen atmosphere

1997 ◽  
Vol 307 (1-2) ◽  
pp. 54-59 ◽  
Author(s):  
A.P. Caricato ◽  
G. Leggieri ◽  
A. Luches ◽  
A. Perrone ◽  
E. Gyorgy ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Nitrogen Atmosphere ◽  
Excimer Laser Ablation

Preparation of PZT/YBCO/YAIO Heterostructure Thin Films by KrF Excimer Laser Ablation

1998 ◽  
Vol 526 ◽  
Author(s):  
Kenji Ebihara ◽  
Hiromnitsu Kurogi ◽  
Yukihiko Yamagata ◽  
Tomoaki Ikegami ◽  
Alexander M. Grishin
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Ferroelectric Properties ◽  
Perovskite Oxide ◽  
Excimer Laser Ablation ◽  
Fatigue Characteristics ◽  
Krf Excimer Laser ◽  
Operation Frequency ◽  
Deposition Conditions

AbstractThe perovskite oxide YBa2Cu3O7-x (YBCO) and Pb(ZrxTi1-x)O3 (PZT) thin films have been deposited for superconducting-ferroelectric devices. KrF excimer laser ablation technique was used at the deposition conditions of 200-600mTorr O2, 2-3J/cm2 and 5-10 Hz operation frequency. Heterostructures of PZT-YBCO-YAlO3:Nd show the zero resistivity critical temperature of 82K and excellent ferroelectric properties of remnant polarization 32 μC/cm2, coercive force of 80kV/cm and dielectric constant 800. Cycling fatigue characteristics and leakage current are also discussed.

Preparation of PbZrxTi1−xO3 Thin Films by KrF Excimer Laser Ablation Technique

1996 ◽  
Vol 433 ◽  
Author(s):  
Hiromitsu Kurogi ◽  
Yukihiko Yamagata ◽  
Tomoaki Ikegami ◽  
Kenji Ebihara ◽  
Bok Yin Tong
Keyword(s):  
Thin Films ◽  
Laser Ablation ◽  
Excimer Laser ◽  
Oxygen Pressure ◽  
Ferroelectric Properties ◽  
Pzt Thin Films ◽  
Excimer Laser Ablation ◽  
Pzt Films ◽  
Krf Excimer Laser ◽  
Laser Ablation Technique

AbstractPb(ZrxTi1−x)O3(PZT) thin films have excellent ferroelectric, optical, piezoelectric and pyroelectric properties. We prepared PZT thin films using the excimer laser ablation technique. A pulsed KrF excimer laser was used to ablate PZT bulk targets. We have studied optimum preparation conditions such as an oxygen pressure, a laser energy fluence and a substrate temperature.In this paper, we investigated the composition, crystallization and ferroelectric properties of the PZT films prepared under various deposition conditions.The X-ray diffraction (XRD) patterns showed that the PZT films prepared on MgO(100) substrates at 600°C and with a laser fluence of 2J/cm2 had a perovskite - pyrochlore mixed structure. The condition of 100 mTorr oxygen pressure provided high quality perovskite films. It is found that the stoichiometric composition of the deposited films is obtained in ambient oxygen of 100˜400 mTorr. The ferroelectric properties of the Pt/PZT/Pt/MgO structure were studied. The capacitance-voltage characteristics and the corresponding hysteresis loop of the dielectric-electric field curve were discussed.We also studied optical emission of the PZT plasma plume to understand quantitative relation between the PZT film quality and the ablation plume plasma. We identified spectral lines originated in Pb, Pb+, Zr, Zr+, Ti, Ti+, PbO and TiO. These spectral intensities have remarkable dependence on the ambient O2 pressure.

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