TY - JOUR
T1 - Composition and phase development of epitaxial superconducting Tl0.78Bi0.22Sr1.6Ba0.4Ca 2Cu3O9-δ thin films by laser ablation and post annealing
AU - Ren, Z. F.
AU - Wang, C. A.
AU - Wang, J. H.
AU - Miller, D. J.
AU - Christen, D. K.
AU - Hettinger, J. D.
AU - Gray, K. E.
N1 - Funding Information:
The authors thank D. Shaw, S. Patel, E. Narumi, and F. Yang for their kindness and help in film preparation and XRD measurements, G. Sagerman for his machining of the target holder, and C.c. Tsuei at IBM for his help in microbridge patterning by laser ablation. This work was supported in part by the New York State Energy Research and Development Authority (NYSERDA), in part by the US Department of Energy (DOE), Office of Basic Energy Sciences Division of Materials Sciences, as part of a program to develop electric power technology under Contract W-31-l09-Eng-38, in part by National Science Foun• dation Office of Science and Technology Centers under contract DMR #91-2ססOO, and in part by the DOE Office of Advanced Utility Concepts, Super• conductivity Program for Electrical Power Systems under contract No. DE-AC05-840R21400 with Mar• tin-Marietta Energy Systems, Inc.
PY - 1996/2/10
Y1 - 1996/2/10
N2 - For the formation of epitaxial superconducting Tl0.78Bi0.22Sr1.6Ba0.4Ca 2Cu3O9-δ((Tl,Bi)-1223) thin films, the dependence of phase development on the chemical state of the source materials, deposition distance from source to substrate, and O2 pressure during deposition by laser ablation and post annealing was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). It was found necessary to have thallium in the precursor film and that a reacted source target is better than the unreacted source for obtaining (Tl,Bi)-1223 phase-pure films. Better (Tl,Bi)-1223 films were obtained at a deposition distance of 44 mm from source to substrate than at a distance of 61 mm over a range of O2 pressure from 5.7 to 31.3 mTorr The best films prepared under the optimal conditions exhibited transport Jc close to 3 × 106 A/cm2 at 77 K and zero field.
AB - For the formation of epitaxial superconducting Tl0.78Bi0.22Sr1.6Ba0.4Ca 2Cu3O9-δ((Tl,Bi)-1223) thin films, the dependence of phase development on the chemical state of the source materials, deposition distance from source to substrate, and O2 pressure during deposition by laser ablation and post annealing was studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). It was found necessary to have thallium in the precursor film and that a reacted source target is better than the unreacted source for obtaining (Tl,Bi)-1223 phase-pure films. Better (Tl,Bi)-1223 films were obtained at a deposition distance of 44 mm from source to substrate than at a distance of 61 mm over a range of O2 pressure from 5.7 to 31.3 mTorr The best films prepared under the optimal conditions exhibited transport Jc close to 3 × 106 A/cm2 at 77 K and zero field.
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U2 - 10.1016/0921-4534(95)00836-5
DO - 10.1016/0921-4534(95)00836-5
M3 - Article
AN - SCOPUS:0030087340
SN - 0921-4534
VL - 258
SP - 129
EP - 136
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
IS - 1-2
ER -