How Reliable is the Cuprates System to Recent Technology?

2016 ◽  
Vol 6 (4) ◽  
pp. 1534
Author(s):  
Emetere M.E. ◽  
Awojoyogbe O.B. ◽  
Uno U.E. ◽  
Isah K.U. ◽  
Sanni E.S. ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Room Temperature ◽  
Engineering Application ◽  
Experimental Results ◽  
Future Research ◽  
Mathematical Approach ◽  
Experimental Room ◽  
High Tc ◽  
High Tc Superconductor

The emergence of cuprates as a high Tc superconductor gave high hopes in the discovery of a room temperature superconductor. It is almost three decades and the highest critical temperature attained on the cuprates is about 135K. A brief overview was conducted on the progress made so far on the cuprates. A mathematical approach was used to design a formula which could determine the experimental results of critical temperature of versed cuprates superconductors. The result of our findings shows that the possibility of attaining the experimental room temperature cuprates superconductor seems very narrow. The study recommended an elaborate approach on the hybridization of cuprates for future research. Hence, there is possibility of having cuprates with wide engineering application.

scholarly journals How Reliable is the Cuprates System to Recent Technology?

2016 ◽  
Vol 6 (4) ◽  
pp. 1534
Author(s):  
Emetere M.E. ◽  
Awojoyogbe O.B. ◽  
Uno U.E. ◽  
Isah K.U. ◽  
Sanni E.S. ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Room Temperature ◽  
Engineering Application ◽  
Experimental Results ◽  
Future Research ◽  
Mathematical Approach ◽  
Experimental Room ◽  
High Tc ◽  
High Tc Superconductor

The emergence of cuprates as a high Tc superconductor gave high hopes in the discovery of a room temperature superconductor. It is almost three decades and the highest critical temperature attained on the cuprates is about 135K. A brief overview was conducted on the progress made so far on the cuprates. A mathematical approach was used to design a formula which could determine the experimental results of critical temperature of versed cuprates superconductors. The result of our findings shows that the possibility of attaining the experimental room temperature cuprates superconductor seems very narrow. The study recommended an elaborate approach on the hybridization of cuprates for future research. Hence, there is possibility of having cuprates with wide engineering application.

A Self-Doped Oxygen-Free High-Critical-Temperature (High-Tc) Superconductor: SmFFeAs

2019 ◽  
Vol 58 (22) ◽  
pp. 15401-15409 ◽  
Author(s):  
Dan Lin ◽  
Han-Shu Xu ◽  
Jingjing Luo ◽  
Haoliang Huang ◽  
Yalin Lu ◽  
...  
Keyword(s):  
Critical Temperature ◽  
High Critical Temperature ◽  
High Tc ◽  
High Tc Superconductor

Features of vortex pinning and magnetic flux creep in epitaxial thin films of high-Tc superconductor YBa2Cu3O7−δ near the critical temperature

2006 ◽  
Vol 32 (8) ◽  
pp. 832-837 ◽  
Author(s):  
M. P. Chornomorets ◽  
D. G. Kovalchuk ◽  
S. M. Ryabchenko ◽  
A. V. Semenov ◽  
E. A. Pashitskii
Keyword(s):  
Thin Films ◽  
Critical Temperature ◽  
Magnetic Flux ◽  
Vortex Pinning ◽  
Flux Creep ◽  
Epitaxial Thin Films ◽  
High Tc ◽  
High Tc Superconductor

STUDY ON PHASE DIAGRAM OF BaO-Y2O3-CuO TERNARY SYSTEM

1987 ◽  
Vol 01 (02) ◽  
pp. 363-365 ◽  
Author(s):  
Guangcan Che ◽  
Jingkui Liang ◽  
Wei Chen ◽  
Sishen Xie ◽  
Yude Yu ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Phase Diagram ◽  
Ternary System ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
High Tc ◽  
X Ray ◽  
High Tc Superconductor

In Ba-R-Cu-O system (R=La, Y) , high Tc superconductor have been discovered (1–3). The room temperature section of the phase diagram in BaO-Y2O3-CuO system has been completed by means of X-ray diffraction, thermal analysis and superconducting measurements.

Dielectric properties of Ln(Mg1/2Ti1/2)O3 as substrates for high-Tc superconductor thin films

1999 ◽  
Vol 14 (6) ◽  
pp. 2484-2487 ◽  
Author(s):  
Seo-Yong Cho ◽  
Chang-Hun Kim ◽  
Dong-Wan Kim ◽  
Kug Sun Hong ◽  
Jong-Hee Kim
Keyword(s):  
Thin Film ◽  
Dielectric Constant ◽  
Room Temperature ◽  
Ybco Thin Film ◽  
X Ray Diffraction ◽  
High Tc ◽  
X Ray ◽  
High Tc Superconductor ◽  
Tan Δ ◽  
Superconductor Thin Films

Ln(Mg1/2Ti1/2)O3 (Ln = Dy, La, Nd, Pr, Sm, Y) compositions have been prepared, and their pertinent properties for use as thin film substrates for YBa2Cu3Ox (YBCO) were measured. X-ray diffraction shows that Ln(Mg1/2Ti1/2)O3 compositions have noncubic symmetry and the GdFeO3-type structure. Dielectric constant measurements revealed values between 22 and 27, which are larger than those of the LnAlO3 family. Quality factor (=1/ tan δ) of the ceramic specimens measured at room temperature was larger than 3000 at 10 GHz. Among the compounds, La(Mg1/2Ti1/2)O3 exhibited the highest dielectric constant and the lowest dielectric loss. Chemical reaction was observed between Ln(Mg1/2Ti1/2)O3 (Ln = Dy, Sm, Y) and YBCO after annealing a 1 : 1 mixture at 950 °C. Considering dielectric and physical properties, La(Mg1/2Ti1/2)O3 and Sm(Mg1/2Ti1/2)O3 were determined to be suitable substrates for YBCO thin film used in microwave applications.

scholarly journals Towards Room-Temperature Superconductivity

2020 ◽  
Author(s):  
Jacob Szeftel ◽  
Nicolas Sandeau ◽  
Michel Abou Ghantous ◽  
Muhammad El Saba
Keyword(s):  
Critical Temperature ◽  
Band Structure ◽  
Electron Concentration ◽  
Stability Criterion ◽  
Room Temperature ◽  
High Tc ◽  
Electron Band ◽  
Room Temperature Superconductivity ◽  
Critical Temperature Tc ◽  
Electron Band Structure

By taking advantage of a stability criterion established recently, the critical temperature Tc is reckoned with help of the microscopic parameters, characterising the normal and superconducting electrons, namely the independent-electron band structure and a repulsive two-electron force. The emphasis is laid on the sharp Tc dependence upon electron concentration and inter-electron coupling, which might offer a practical route toward higher Tc values and help to understand why high-Tc compounds exhibit such remarkable properties.

scholarly journals Towards Room-Temperature Superconductivity

2021 ◽  
Author(s):  
Jacob Szeftel ◽  
Nicolas Sandeau ◽  
Michel Abou Ghantous ◽  
Muhammad El Saba
Keyword(s):  
Critical Temperature ◽  
Band Structure ◽  
Electron Concentration ◽  
Stability Criterion ◽  
Room Temperature ◽  
High Tc ◽  
Electron Band ◽  
Room Temperature Superconductivity ◽  
Critical Temperature Tc ◽  
Electron Band Structure

By taking advantage of a stability criterion established recently, the critical temperature Tc is reckoned with help of the microscopic parameters, characterising the normal and superconducting electrons, namely the independent-electron band structure and a repulsive two-electron force. The emphasis is laid on the sharp Tc dependence upon electron concentration and inter-electron coupling, which might offer a practical route toward higher Tc values and help to understand why high-Tc compounds exhibit such remarkable properties.

Direct structure information using the focus-variation method

1993 ◽  
Vol 51 ◽  
pp. 1068-1069
Author(s):  
D. Van Dyck ◽  
M. Op de Beeck
Keyword(s):  
Electron Microscope ◽  
Field Emission ◽  
Ccd Camera ◽  
Experimental Results ◽  
Variation Method ◽  
High Tc ◽  
Structure Information ◽  
High Tc Superconductor ◽  
Focus Variation ◽  
The One

1. Introduction In, a new method was proposed to reconstruct the exit wavefunction of an object from a combination of images at closely spaced focus values. Recently, in the framework of a Brite-Euram project, the method has been implemented on a Philips CM20 ST electron microscope equipment with Field emission source and CCD camera. The first experimental results for the high TC superconductor YBa2Cu4O8 are presented in. In this case, the object is very thin so that the phase of the wavefunction directly reveals the projected potential of the atom columns. The oxygen columns could be observed with a resolution of 0.13 nm. However, when the object is thicker, the one-to-one correspondence between the wavefunction and the projected structure is not so straightforward due to the dynamical diffraction. This is shown in Figure 1 for Ba2NaNb5O15 where the heavy columns are revealed in the amplitude and the bright columns in the phase.

High resolution STEM imaging study on high Tc superconductor YBa2CuaO7-x

1988 ◽  
Vol 46 ◽  
pp. 882-883
Author(s):  
H.-J. Ou ◽  
J. M. Cowley
Keyword(s):  
Crystal Structure ◽  
High Resolution ◽  
Grain Boundary ◽  
Strong Field ◽  
Imaging Study ◽  
Structure Defects ◽  
High Tc ◽  
High Tc Superconductor ◽  
Diffraction Patterns ◽  
Lattice Planes

Using the dedicate VG-HB5 STEM microscope, the crystal structure of high Tc superconductor of YBa2Cu3O7-x has been studied via high resolution STEM (HRSTEM) imaging and nanobeam (∽3A) diffraction patterns. Figure 1(a) and 2(a) illustrate the HRSTEM image taken at 10' times magnification along [001] direction and [100] direction, respectively. In figure 1(a), a grain boundary with strong field contrast is seen between two crystal regions A and B. The grain boundary appears to be parallel to a (110) plane, although it is not possible to determine [100] and [001] axes as it is in other regions which contain twin planes [3]. Following the horizontal lattice lines, from left to right across the grain boundary, a lattice bending of ∽4° is noticed. Three extra lattice planes, indicated by arrows, were found to terminate at the grain boundary and form dislocations. It is believed that due to different chemical composition, such structure defects occur during crystal growth. No bending is observed along the vertical lattice lines.

Electron-Probe Quantitative Energy-Dispersive Analysis of Trace Magnesium Concentrations in Ag-Mg Alloys

1996 ◽  
Vol 54 ◽  
pp. 510-511
Author(s):  
R. B. Marinenko
Keyword(s):  
Electron Probe ◽  
Energy Dispersive Spectrometry ◽  
Mg Alloys ◽  
Energy Dispersive ◽  
Energy Dispersive Analysis ◽  
High Tc ◽  
Alloy Wire ◽  
High Tc Superconductor ◽  
Eds Analysis ◽  
Superior Mechanical Properties

Internally oxidized Ag-Mg alloys are used as sheaths for high Tc superconductor wires because of their superior mechanical properties. The preparation and characteristics of these materials have been reported. Performance of the sheaths depends on the concentration of the magnesium which generally is less than 0.5 wt. percent. The purpose of this work was to determine whether electron probe microanalysis using energy dispersive spectrometry (EDS) could be used to quantitate three different Ag-Mg alloys. Quantitative EDS analysis can be difficult because the AgL escape peak occurs at the same energy (1.25 keV) as the Mg Kα peak. An EDS spectrum of a Ag-Mg alloy wire is compared to a pure Ag spectrum in Fig. 1.

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