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2 edition of Flux pinning, defect analysis and growth of high temperature superconducting single crystals found in the catalog.

Flux pinning, defect analysis and growth of high temperature superconducting single crystals

Guang Yang

Flux pinning, defect analysis and growth of high temperature superconducting single crystals

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Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D) - University of Birmingham, School of Physics and Space Research, 1994.

Statementby Guang Yang.
ID Numbers
Open LibraryOL21124098M

Figure 1. Comparison of the temperature (T) dependence of magnetization (M) for the pure (x = 0) and the Pb-doped (x = and ) single te values of M are displayed in a semilogarithmic plot. The data forx = and are multiplied by a factor of 2 and 4, respectively, for clarity. The measurements were carried out in a superconducting quantum interference device (SQUID   In YBa2Cu3O7-x thin films grown on vicinal cut SrTiO3 single crystals a regular array of antiphase boundaries is generated causing an anisotropic enhancement of flux-line pinning. In the case of La-CaMn-O thin films grown on vicinal cut substrates it could be demonstrated that magnetic in-plane anisotropy is  › 百度文库 › 语言/资格考试. The correlation between growth, nanostructure, and physical properties is a key issue in developing practical superconducting materials. This Special Issue aims to focus on the latest advances in superconducting film processing nanoengineering, characterization, and their fundamental impact on all practical ://   MgB2 single crystals substituted with Li and with Li-C: Structural and superconducting properties aJ. Karpinski, aN. Zhigadlo, aS. Katrych, aB. Batlogg, b,aM. Tortello, c,aK. Rogacki, d,aR. Puzniak aLaboratory for Solid State Physics, ETH, Zurich, Switzerland bDipartimento di Fisica and CNISM, Politecnico di Torino, Torino, Italy cInstitute of Low Temperature and Structure

Preface. 1. Fundamentals. Introduction to Superconductivity in High-temperature Supersconductors (HTSCs). Introductory Remarks. Internal Nomenclature. Critical Currents and Flux Motion in Superconductors. Magnetization Curve of a Type II Superconductor. Determination of Critical Currents from Magnetization ://


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Flux pinning, defect analysis and growth of high temperature superconducting single crystals by Guang Yang Download PDF EPUB FB2

Journal of Alloys and Compounds, () JALCOM Flux pinning by columnar defects in high-temperature superconducting crystals w ki(1) Yeshurun(2) M. Konczyko s, Y. Klein(2), (2), N. Chikumoto(1)(3), V.M. Vinokur(4) and M.V. Feigel'man(5) (1) L.S.I., Ecole Polytechnique, Palaiseau, France (2) Bar-Ilan University, Ramat-Gan, Israel (3)   Striving to improve the critical current density Jc of superconducting YBa2Cu3O6+x (YBCO) thin films via enhanced vortex pinning, the interplay between film growth   Single grain (Gd, Dy)BCO bulks were fabricated via cold-top-seeded infiltration growth process in air.

Microstructural observations clarified that the size and dispersion of embedded (Gd, Dy) 2 BaCuO 5 () secondary phase particles strongly varied in dependence of the grain refiners.

The combined addition of Pt and CeO 2 in each amount of wt% increased the critical current density (J   1 Flux free growth of large FeSe 1/2 Te 1/2 superconducting single crystals by an easy high temperature melt and slow cooling method P.

K Maheshwari1,2, Rajveer Jha1, Bhasker Gahtori1, and V.P.S. Awana1* 1CSIR-National Physical Laboratory, Dr. Krishnan Marg, New Delhi, India 2AcSIR-National Physical Laboratory, New Delhi, India Strong pinning depends on the pinning force strength and number density of effective defects.

Using the hydrostatic pressure method, we demonstrate here that hydrostatic pressure of GPa can significantly enhance flux pinning or the critical current density (J c) of optimally doped Ba K Fe 2 As 2 crystals by a factor of up to 5 in both low and high fields, which is generally rare Single crystals of (Hg,Re)Ba2Can-1CunO2+2n+delta (n = 2, 3, 4) with size up to 1 × × mm3 were grown by the flux method in quartz ampoules from flux compositions with excess Ba and ://   Abstract.

This volume presents current studies in high-temperature superconductivity research. Topics covered include: flux pinning of melt processed YBCO superconductors and their applications, neutron irradiation effects in high Tc single crystals, redox mechanisms in high Tc superconducting cuprates, thermal expansion and Grunelsen parameters of high Tc superconductors,   We report successful growth of flux free large single crystals of superconducting FeSe1/2Te1/2 with typical dimensions of up to few cm.

The AC and DC magnetic measurements revealed the superconducting transition temperature (Tc) value of around K and the isothermal MH showed typical type-II superconducting behavior. The lower critical field (Hc1) being estimated by   Single domain GdBCO bulk superconductors have been fabricated by the top-seeded infiltration and growth process (Gd+ TSIG) with solid phase compositions of (1-x)(Gd 2 O 3 +BaCuO 2)+xLi 2 CO 3, (x=0, wt%).The effect of Li 2 CO 3 doping on the growth defect analysis and growth of high temperature superconducting single crystals book, microstructure, levitation force, trapped field and critical temperature (T c) of single High temperature superconducting (HTS) conductor on round core (CORC) cable is considered as a potential technology for power applications, because of its high current-carrying capacity Albrecht, J., Djupmyr, M.

& Brück, S. Universal temperature scaling of flux line pinning in high-temperature superconducting thin films. Journal of Physics: Condensed Mat ().

The flux pinning enhancement of type II superconductors with defects have been studied in both copper-oxide high- and low-temperature superconductor materials 3,4,An areal number density of Thin films of the high-temperature superconductor YBa2Cu3O7−δ exhibit both a large critical current (the superconducting current density generally lies between and A m−2 at K in   The concept of an artificially increased pinning landscape in thin films of high-temperature (High-T c) superconductors is highly attractive for many applications.

Often the most crucial property for reasonable operation of superconducting films is the efficient suppression of flux line motion to avoid unwanted dissipation and magnetic :// This alloy, with a critical temperature of K is suitable primarily for low and intermediate fields (of high temperature superconductors (HTS) inthe most used high temperature and high field material remained Nb 3 :// Anisotropy of the superconducting state parameters and intrinsic pinning in low-level Pr-doped Y Ba 2 Cu 3 O 7 single crystals To cite this article: A Kortyka et al Supercond.

Sci. Technol. 23 superconducting properties of single-View the article online for updates and enhancements. Related content Superconducting state parameters,   Although superconducting ReBa 2 Cu 3 O 7−δ (ReBCO) materials are highly anisotropic due to their intrinsic layered structures, the microstructure and flux pinning properties are significantly improved by artificially introducing multilayers of ReBCO with various second phase materials [].Particularly, multilayering of YBa 2 Cu 3 O 7−δ (YBCO) films on single crystal or metal substrates   We report on the growth of whisker-like TmBa 2 Cu 3 O 6+x (Tm) single crystals which are especially suitable for studying the anisotropic electron transport.

We have found that the formation of Tm crystals from the flux starts with the growth of skeletons (dendrites), and their familiar plate habit develops through the following skeleton :// Growth of Single Crystals of Various High-T c Superconductors (L F Schneemeyer) Ceramic Processing and Wire Fabrication of High-T c Superconductors (D T Shaw and S Jin) Processing for High J c Bi-Sr-Ca-Cu-O Wires (K Sato) Melt Processing and Properties of Y-Ba-Cu-O (K Salama et al.) Melt Process, Flux Pinning and Levitation (M Murakami) Local magnetic measurements are used to quantitatively characterize heterogeneity and flux line pinning in PrFeAsO_1-y and NdFeAs(O,F) superconducting single :// Abrikosov vortex line interaction with different type of crystal defects is considered for moderately anisotropic high-T c superconductor YBa 2 Cu 3 O 7– types of a quenched disorder are shown to give the major contributions into the anisotropic and nonmonotonous field dependencies of the critical current density, j c (H,θ), the irreversible magnetization M irr (H,θ) and volume   Growth and physical properties of bulk REBa2Cu3O7−δ (REBCO) superconductors fabricated by the infiltration growth (IG) method strongly depend on the initial size and morphology of the RE2BaCuO5 () particles.

The present work details the novel method we developed for producing sharp-edged and surface-damaged particles to be added to the REBCO bulks. We employed high Large-scale superconducting electric devices for power industry depend critically on wires with high critical current densities at temperatures where cryogenic losses are tolerable.

This restricts   1 Unique defect structure and advantageous vortex pinning properties in superconducting CaKFe4As4 Shigeyuki Ishida1*, Akira Iyo1, Hiraku Ogino1, Hiroshi Eisaki1, Nao Takeshita1, Kenji Kawashima2, Keiichi Yanagisawa3, Yuuga Kobayashi3, Koji Kimoto3, Hideki Abe3, Motoharu Imai3, Jun-ichi Shimoyama4, and Michael Eisterer5 1Electronic and Photonics Research Institute, National Abstract.

Iron chalcogenide superconducting thin films and coated conductors are attractive for potential high field applications at liquid helium temperature for their high critical current densities J c, low anisotropies, and relatively strong grain ing flux pinning defects is a general approach to increase the in-field performance of :// This phenomenon is the result of a flux motion on a pinning centers in high temperature superconducting materials.

The detection of ac dissipation was performed in a low ac field (15 and 22 MHz F-substituted NdOBiS2 superconducting single crystals were grown using CsCl/KCl flux.

This is the first example of the single-crystal growth of a BiS2-based :// Abstract. We study the effect of proton irradiation on Ba(Fe Co ) 2 As 2 superconducting single crystals from combined magnetisation and magnetoresistivity measurements.

The study allows the extraction of the values of the apparent pinning energy U 0 of the samples prior to and after irradiation, as well as comparison of the values of U 0 obtained from the flux-flow reversible region   Since the discovery of its superconducting properties in [] MgB 2 has become a popular and promising material for superconductivity applications due to its interesting combination of critical temperature (T c) of 39 K is the highest of any binary compound at ambient pressure, and makes it more suitable for helium-free applications than other low temperature Dew-Hughes D.

Flux pinning mechanisms in type ii superconductors. Phil. Mag. 30, (). Murakami M. Melt processed High-temperature superconductors (World Scientific, Singapore, ). Ghorbani S. et al. Flux pinning and vortex transitions in doped BaFe 2 As 2 single crystals. Appl. Phys. Lett. ().

supercurrent flow or as weak flux pinning sites. However, this latter effect has been ruled out by careful analysis of the I-Vcharacteristics of the grain boundaries exposed to microwave radiation [14]. For smaller Ato (high current density can be transported between the :// Superconducting foams of YBa2Cu3Oy (YBCO) are proposed as trapped field magnets or supermagnets.

The foams with an open-porous structure are light-weight, mechanically strong and can be prepared in large sample sizes. The trapped field distributions were measured using a scanning Hall probe on various sides of an YBCO foam sample after field-cooling in a magnetic field of T produced by a   Abstract: The Table of Contents for the book is as follows: EDITOR'S FOREWORD.

OVERVIEWS. Flux lines in 3D and 2D superconductors. Observation of pinning effects in Bi 2 Sr 2 CaCu 2 O 8+x single crystals and whiskers using a decoration technique.

Effect of twin boundary density on the vortex melting transition in YBa 2 Cu 3 O 7-δ single crystals. Studies by neutron diffraction and μSR of   morphologies (polycrystalline, single crystals, thin films, tapes, artificial superconducting superlattices). The major theme common to most of the research done on the above-mentioned materials is the study of vortex matter, dynamics, and pinning, which determine a large number of superconducting properties for various :// 教师姓名: 赵勇 所在单位: 超导与新能源研究开发中心 学历: 博士研究生毕业 办公地点: 西南交通大学土木馆室 联系方式: 电子邮箱:[email protected] 办公电话: 学位: 理学博士学位 职称: 教授 电子邮箱: [email protected]:// A flux pinning model is presented which predicts the maximum critical current density attainable in superconductors.

That such a limit must exist comes from the realization that flux pinning is strongest in regions of weak superconductivity, but these regions cannot carry a large ://   A study by Awaji et al finds that the low-temperature flux pinning behavior in 1D APCs introduced in Sm + vol%BaHfO 3 (BHO) films can be described as strong 1D APC pinning in the low field, and the coexistence of collective pinning from both nanorod pinning and random pinning in the high Some subtleties of the pinning landscapes are hard to anticipate.

For instance, when we initially introduced CDs in YBa 2 Cu 3 O 7 single crystals by irradiation with MeV Sn heavy ions, we observed a huge J c enhancement ().Transmission electron microscopy images showed that the amorphous tracks were slightly splayed (due to Rutherford scattering) and somewhat inhomogeneous Thermal expansion of Bi Sr CaCu 2 O x superconductor single crystals.

D. Lawther, S. Ritcey Pages OriginalPaper. Flux pinning in high-T c superconductive films. Shi Current-voltage characteristics of high-temperature superconducting ceramics with the “Peak effect” in the magnetic field dependence High‐temperature superconductor Y is indeed among the most relevant playgrounds for the investigation of the physics of magnetic flux lines, in which nanoscale defects are essential to pin vortices and prevent resistive losses in the presence of magnetic fields.

10 Accordingly, significant efforts have been made in recent years toward. MgB2 single crystals high pressure growth and anisotropic properties_专业资料。Single crystals of MgB2 with a size up to xx mm3 have been grown with a high pressure cubic anvil technique.

The crystal growth process is very peculiar and involves  › 百度文库 › 语言/资格考试. single crystal by using low melting point alloy flux for the new superconducting material exploration and new single crystal growth technique. In this paper, we investigated the single crystal growth of MgB 2 by using low melting point alloy flux.

The selection principle of alloy flux   high fields, with degradation of the superconducting critical temperature (T. c) another drawback. For instance, proton irradiation can only enhance flux pinning in high fields by inducing point defects BaK.

Similarly, in light ion C. 4+ irradiation of BaNi crystals can only enhance. J. c. in low fields at high temperatures [1]. High