Precisely determined temperature window size for the growth of high quality c-axis oriented YBCO films by photo-assisted MOCVD

2008 ◽  
Vol 468 (21) ◽  
pp. 2213-2218 ◽  
Author(s):  
Guoxing Li ◽  
Xiujun Fang ◽  
Lei Zhao ◽  
Shanwen Li ◽  
Zhongmin Gao ◽  
...  
Keyword(s):  
Window Size ◽  
High Quality ◽  
Ybco Films ◽  
Temperature Window

Very Thick Coherently Strained GexSi1−x Layers Grown in a Narrow Temperature Window

1991 ◽  
Vol 220 ◽  
Author(s):  
C. H. Chern ◽  
K. L. Wang ◽  
G. Bai ◽  
M. -A. Nicolet
Keyword(s):  
Growth Temperature ◽  
Strain Relaxation ◽  
Gas Pressure ◽  
High Density ◽  
Misfit Dislocations ◽  
High Quality ◽  
Strained Layers ◽  
Temperature Window ◽  
Residual Gas

ABSTRACTStrain relaxation of GexSi1−x layers is studied as a function of growth temperature. Extremely thick coherently strained layers whose thicknesses exceed more than fifty times of the critical thicknesses predicted by Matthews and Blakeslee's model were successfully grown by MBE. There exits a narrow temperature window from 310 °C to 350 °C for growing this kind of high quality thick strained layers. Below this temperature window, the layers are poor in quality as indicated from RHEED patterns. Above this window, the strain of the layers relaxes very fast accompanied with a high density of misfit dislocations as the growth temperature increases. Moreover, for samples grown in this temperature window, the strain relaxation shows a dependence of the residual gas pressure, which has never been reported before.

Fabrication of High-Quality Epitaxial YBCO Films Prepared by Fluorine-Free MOD

2011 ◽  
Vol 21 (3) ◽  
pp. 2767-2770 ◽  
Author(s):  
Jung-Woo Lee ◽  
Yun-Sik Joo ◽  
Seung-Hyun Moon ◽  
Sang-Im Yoo
Keyword(s):  
High Quality ◽  
Ybco Films

Improving sol-gel Yba2Cu3O7−δ film morphology using high-boiling-point solvents

2002 ◽  
Vol 17 (8) ◽  
pp. 1900-1903 ◽  
Author(s):  
J. T. Dawley ◽  
P. G. Clem ◽  
M. P. Siegal ◽  
D. R. Tallant ◽  
D. L. Overmyer
Keyword(s):  
Critical Current Density ◽  
Boiling Point ◽  
Sol Gel ◽  
Film Morphology ◽  
High Quality ◽  
Proper Selection ◽  
Ybco Films ◽  
Superconducting Wires ◽  
Sol Gel Process ◽  
High Boiling Point

The effect of high-boiling-point solvent addition on the morphology of low-p(O2) processed, sol-gel YBa2Cu3O7−δ (YBCO) films is discussed. Proper selection and addition of a high-boiling-point solvent prevents film roughening during precursor pyrolysis, while permitting at least a tenfold reduction in pyrolysis time compared to standard film processing in air or O2. Use of such solvents appears to increase film plasticity, avoiding elastic compressive stress related buckling. High-quality YBCO films on 〈100〉 LaAlO3 with a critical current density (Jc) ∼ 3–4 MA/cm2 at 77 K, are routinely crystallized with this new sol-gel process. Diethanolamine-based, sol-gel YBCO films deposited on sol-gel SrTiO3-buffered 〈100〉 Ni have Jc(77 K) > 1 MA/cm2, demonstrating a route toward all-sol-gel superconducting wires.

Buffer layers for high-quality epitaxial YBCO films on Si

1991 ◽  
Vol 1 (1) ◽  
pp. 67-73 ◽  
Author(s):  
D.K. Fork ◽  
D.B. Fenner ◽  
A. Barrera ◽  
J.M. Phillips ◽  
T.H. Geballe ◽  
...  
Keyword(s):  
Buffer Layers ◽  
High Quality ◽  
Ybco Films

Progress towards a low-cost commercial coated conductor

2001 ◽  
Vol 689 ◽  
Author(s):  
Suresh Annavarapu ◽  
Nguyet Nguyen ◽  
Sky Cui ◽  
Urs Schoop ◽  
Cees Thieme ◽  
...  
Keyword(s):  
Critical Current ◽  
High Performance ◽  
Low Cost ◽  
Critical Currents ◽  
Short Length ◽  
Coated Conductor ◽  
High Quality ◽  
Ybco Films ◽  
Performance Levels ◽  
Current Densities

ABSTRACTYBCO films prepared from metal trifluoroacetate (TFA) precursors on oxide-buffered textured non-magnetic substrates have achieved performance levels equaling that on oxide buffered textured Ni substrates. Critical current densities of 0.7 MA/cm2 to 1.0 MA/cm2 have been achieved in 0.4 µm thick YBCO films on short-length of CeO2/YSZ/Y2O3/Ni/Ni-13wt%Cr substrates. High-quality epitaxial buffers comprising a Ni layer, Y2O3 seed, YSZ barrier and CeO2 cap layers have been deposited over meter long tapes of deformation textured Ni and Ni-13%Cr using reel-to-reel processes. High-performance TFA-based YBCO films have been deposited on 0.1 m to 0.3 m lengths of these oxide buffered substrates using reel to reel processes. Critical current densities up to 1.0 MA/cm2 have been achieved in 0.4 µm thick YBCO films on CeO2/YSZ/Y2O3/Ni substrates. Using multiple coats of the metal trifluoroacetate precursors, thicker YBCO films have been demonstrated on oxide buffered substrates. Critical currents in excess of 100A/cm-width have been achieved for 1.2 µm -1.6 µm thick YBCO films on short lengths of CeO2/YSZ/Y2O3/Ni substrates.

High Jc YBa2Cu3O7-δ films via rapid, low pO2 pyrolysis

2001 ◽  
Vol 16 (1) ◽  
pp. 13-16 ◽  
Author(s):  
J. T. Dawley ◽  
P. G. Clem ◽  
M. P. Siegal ◽  
D. L. Overmyer
Keyword(s):  
Trifluoroacetic Acid ◽  
Processing Time ◽  
Sol Gel ◽  
High Quality ◽  
Metal Acetate ◽  
Ybco Films

In this investigation YBa2Cu3O7-δ (YBCO) films were fabricated via a metal acetate, trifluoroacetic acid based sol-gel route and spin-coat deposited on (100) LaAlO3 with a focus on maximizing Jc, while minimizing processing time. We demonstrate that the use of a low-pO2 atmosphere during the pyrolysis stage can lead to at least a tenfold reduction in pyrolysis time, compared to a 1 atm O2 ambient. High-quality YBCO films on LaAlO3, with Jc values up to 3 MA/cm2 at 77 K, can be routinely crystallized from these rapidly pyrolyzed films.

Fabrication of High-Quality Ion-Beam Deposited Cubic Oxide Template Films on Meter-Length Substrates

1999 ◽  
Vol 585 ◽  
Author(s):  
P. N. Arendt ◽  
J. R. Groves ◽  
S. R. Foltyn ◽  
Q. X. Jia ◽  
E. J. Peterson ◽  
...  
Keyword(s):  
Ion Beam ◽  
Short Length ◽  
Stationary Mode ◽  
Superconducting Properties ◽  
High Quality ◽  
Ybco Films ◽  
Cubic Zirconia ◽  
Ion Beam Assisted Deposition ◽  
Flexible Metal

AbstractIon-beam assisted deposition was used to fabricate biaxially aligned cubic zirconia on flexible metal substrates. These films were used as templates for heteroepitaxially deposited YBa2Cu3O7-δ (YBCO) films. The quality of the crystalline texture of the template films has a direct influence on the superconducting properties of the final YBCO films. We describe our efforts to fabricate high-quality cubic zirconia templates on short-length substrates processed in stationary mode and meter-long substrates processed in continuous mode. Our best phi scan FWHM values for the films on the meter-long tapes were 12.6 degrees for the template and 6.1 degrees for the overcoated YBCO. This meter-long tape had a self-field, 75 K, superconducting critical current of 122 amps.

HTSC grain boundary weak links employing high-quality ICM sputtered YBCO films

1994 ◽  
Vol 16 (12) ◽  
pp. 1967-1972 ◽  
Author(s):  
C. Camerlingo ◽  
H. Huang ◽  
B. Ruggiero ◽  
M. Russo ◽  
E. Sarnelli ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Weak Links ◽  
High Quality ◽  
Ybco Films
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