Synthesis of Y-Ba-Cu-O Superconducting Thin Films by Metalorganic Chemical Vapor Deposition PDF Download
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Author: Chyi Shyuan Chern
Publisher:
ISBN:
Category :
Languages : en
Pages : 390
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Author: Chyi Shyuan Chern
Publisher:
ISBN:
Category :
Languages : en
Pages : 390
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Author: Dong-Wook Noh
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Richard Joseph McNeely
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Metal-organic chemical vapor deposition (MOCVD), utilizing volatile metalorganic sources Ba(hfa)2·mep, Ca(hfa)2·tet, and Cu(dpm)2 (hfa hexafluoroacetylacetonate, mep = methylethylpentaglyme, tet = tetraglyme, dpm dipivaloylmethanate) characterized by thermogravimetric analysis (TGA), is employed to grow BaCaCuO(F) thin films on crystalline (110) LaAlO3. An ex situ, bulk pellet equilibrium anneal incorporates thallium to form epitaxial, superconducting Tl2Ba 2CaCu2O8 (Tl-2212) and TlBa2Ca 2Cu3O9+x (Tl-1223) thin films. The film electrical properties are determined by transport and magnetic measurements, and the film microstructures are characterized by x-ray diffraction, electron microscopy, and profilometry. The Tl-2212 films, formed via a Tl2O3/Tl 2O anneal at temperatures of 720--890°C in flowing O2 /Ar (0--100%), exhibit Tc ∼ 105 K, Jc = 1.2 x 105 A/cm2 (77 K), and microwave surface resistance, Rs , as low as 400 muO (40 K; 10 GHz). These Tl-2212 films are also incorporated into an MOCVD process utilizing Mg(dPM)2 to form Tl-2212/MgO/Tl-2212 trilayer structures. However, rough surface morphology is found to affect the quality of the resulting trilayer structures by allowing pinhole defects that permit interlayer shorting. The Tl-1223 films are formed via a novel TlF annealing process that affords phase-selective nucleation under a wide range of conditions that produce multiple-phase samples when Tl2O3/Tl2O is employed as the thallium source. The microstructure and electrical properties of these TIF-annealed films are fully characterized, with typical values of Tc ∼ 103 K and Jc ∼ 2 x 105 A/cm2 (5 K). Calculated flux pinning activation energies of MOCVD-derived, TlF-annealed Bi- and Sr-substituted Tl-1223 analogs are found to agree with literature values. On unsubstituted TlF-annealed Tl-1223 thin films, a quenching study is undertaken to elucidate the function of fluoride in the TlF annealing process. X-ray diffraction and electron microscopy of thin films quenched at various stages in an optimized annealing schedule reveal the phase evolution and microstructural development of the resulting Tl-1223 thin films. It is proposed that TIF reacts with BaO in the bulk pellet and forms Tl2O early in the annealing process to thereby afford a higher Tl2O partial pressure during initial stages in superconducting phase formation.
Author: L. Correra
Publisher: Elsevier
ISBN: 0444600256
Category : Technology & Engineering
Languages : en
Pages : 908
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Interdisciplinary research on superconducting oxides is the main focus of the contributions in this volume. Several aspects of the thin film field from fundamental properties to applications are examined. Interesting results for the Bi system are also reviewed. The 132 papers, including 8 invited, report mainly on the 1-2-3 system, indicating that the Y-Ba-Cu-O and related compounds are still the most intensively studied materials in this field. The volume attests to the significant progress that has been made in this field, as well as reporting on the challenging problems that still remain to be solved.
Author: Dale Dane Berkley
Publisher:
ISBN:
Category :
Languages : en
Pages : 194
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Author: R.D. McConnell
Publisher: Springer Science & Business Media
ISBN: 146845658X
Category : Science
Languages : en
Pages : 542
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Book Description
The Conference on the Science and Technology of Thin Film Superconductors was conceived in the early part of 1988 as a forum for the specialist in thin film superconductivity. The conference was held on November 14-18, 1988, in Co lorado Springs, Co lorado. Al though many excellent superconductivity conferences had been convened in the wake of the 1986-1987 discoveries in high temperature superconductivity, thin film topics were often dispersed among the sessions of a more general conference agenda. The response to the Conference on the Science and Technology of Thin Film Superconductors confirmed the need for an extended conference devoted to thin film superconductors. These proceedings are a major contribution to the technnology of thin film superconductivity because of the breadth and quality of the articles provided by leaders in the field. The proceedings are divided into articles on laser deposition, sputtering, evaporation, metal organic chemical vapor deposition, thick film, substrate studies, characterization, patterning and applications, and general properties. Most of the articles discuss scientific issues for high temperature thin film superconductors, although the conference was to be a forum for technology and scientific questions for both low and high temperature superconductivity. For the first day of the 5 day conference, Lawrence Berkeley Laboratory had organized an excellent set of short courses in superconduc t ing thin film devices.
Author: Bruce Jackson Hinds
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Yi-Han Kao
Publisher: Springer Science & Business Media
ISBN: 1468475657
Category : Science
Languages : en
Pages : 795
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Book Description
This Proceedings is a collection of papers presented at the Third Annual Conference on Superconductivity and Applications organized by the New York State Institute on Superconductivity. This year the Conference was held at the Buffalo Hilton Hotel on September 19- 21, 1989, with previous meetings on September 28-29,1987, and April 18-20, 1988. As in previous years, this meeting was highly successful, with an attendance of over three hundred researchers participating in lively scientific exchanges and discussions. The high quality of the talks is evident in this Proceedings. The field of high temperature superconductivity has matured considerably since its early days of media frenzy and rapid new discoveries. However, the enthusiasm and pace of research have not slowed down. A much better picture of the nature of high temperature superconductivity, the properties of these new materials and where they may find their eventual use has emerged. Processing techniques, especially thin film deposition, have been perfected nearly to the point of allowing commercial applications. We expect continued phenomenal growth of the field of high temperature superconductivity, both in terms of research and applications for many years to come.
Author: Qin-Yun Ying
Publisher:
ISBN:
Category :
Languages : en
Pages : 426
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Author: Neng-Jye Hsu
Publisher:
ISBN:
Category : Superconductors
Languages : en
Pages : 252
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