The doping dependence of the irreversibility line in grain-aligned Sm1−xEuxBa2Cu3O7−δ high-Tc superconductor

2010 ◽  
Vol 10 (5) ◽  
pp. 1345-1348 ◽  
Author(s):  
Dawood Ahmad ◽  
Tae Kwon Song ◽  
Insuk Park ◽  
G.C. Kim ◽  
Y.C. Kim
Keyword(s):  
Irreversibility Line ◽  
High Tc ◽  
Doping Dependence ◽  
High Tc Superconductor

Irreversibility line and flux pinning properties in iron-based high-Tc superconductor SmFeAsO0.85

2009 ◽  
Vol 469 (15-20) ◽  
pp. 1052-1054 ◽  
Author(s):  
D. Ahmad ◽  
I. Park ◽  
G.C. Kim ◽  
J.H. Lee ◽  
Z.-A. Ren ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Irreversibility Line ◽  
High Tc ◽  
High Tc Superconductor ◽  
Iron Based ◽  
Pinning Properties

Magnetic irreversibility line of the high-Tc superconductor Bi(4413)

1996 ◽  
Vol 46 (S3) ◽  
pp. 1627-1628
Author(s):  
Ralf Noetzel ◽  
Bernd vom Hedt ◽  
Kurt Westerholt
Keyword(s):  
Irreversibility Line ◽  
High Tc ◽  
High Tc Superconductor ◽  
Magnetic Irreversibility

scholarly journals CORRELATION BETWEEN THE IRREVERSIBILITY LINE AND PINNING POTENTIAL IN HIGH-Tc SUPERCONDUCTOR YBa2Cu3O7-δ

1992 ◽  
Vol 41 (1) ◽  
pp. 123
Author(s):  
JIN XIN ◽  
ZHANG YI-TONG ◽  
LU RUI-XI ◽  
YAO XI-XIAN ◽  
LIU FENG-SHENG ◽  
...  
Keyword(s):  
Irreversibility Line ◽  
High Tc ◽  
High Tc Superconductor ◽  
Pinning Potential

ANALYSIS OF MAGNETIC CRITICAL FIELDS IN IRON-BASED SmFeAsO0.85 HIGH-Tc SUPERCONDUCTOR

2011 ◽  
Vol 25 (24) ◽  
pp. 1939-1948 ◽  
Author(s):  
DAWOOD AHMAD ◽  
TAE KWON SONG ◽  
IN SUK PARK ◽  
G. C. KIM ◽  
ZHI-AN REN ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Low Temperatures ◽  
Irreversibility Line ◽  
Linear Temperature Dependence ◽  
Critical Fields ◽  
Linear Temperature ◽  
High Tc ◽  
High Tc Superconductor ◽  
Pressure Synthesis ◽  
Iron Based

The magnetic properties of the newly discovered iron-oxypnictide SmFeAsO 0.85 high-Tc superconductor with a Tc of around 55 K were investigated. Bulk SmFeAsO 0.85 was prepared by a method for high-pressure synthesis. The lower critical field H c1 was estimated from the magnetization at low fields; H c1 (0) was measured to be 212 Oe. A linear temperature dependence instead of saturation at low temperatures in H c1 (T) revealed unconventional superconductivity with a nodal gap structure in our SmFeAsO 0.85 superconductor. The results showed that the well-known secondary peak in the temperature dependence of the critical current density Jc is absent in the SmFeAsO 0.85 high-Tc superconductor. The irreversibility line B irr was fitted well by the power law dependence (1 - T/Tc)n with n ~ 1.5. This is indicative of the flux creep phenomena in the SmFeAsO 0.85 high-Tc superconductor. In addition, within the range of measurement temperatures in this study, no crossover was observed in the temperature dependence of the irreversibility line B irr which may be due to low anisotropy in our SmFeAsO 0.85 superconductor.

Flux pinning, granularity and the irreversibility line of the high-Tc superconductor HgBa2Cu04+x

Nature ◽  
1993 ◽  
Vol 364 (6433) ◽  
pp. 129-131 ◽  
Author(s):  
A. Umezawa ◽  
W. Zhang ◽  
A. Gurevich ◽  
Y. Feng ◽  
E. E. Hellstrom ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Irreversibility Line ◽  
High Tc ◽  
High Tc Superconductor

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.

Evidence for magnetic organization of high Tc superconductor YBa 2 Cu8O7 observed by neutron diffraction

1987 ◽  
Vol 48 (10) ◽  
pp. 1623-1625 ◽  
Author(s):  
B. Farnoux ◽  
R. Kahn ◽  
A. Brulet ◽  
G. Collin ◽  
J.P. Pouget
Keyword(s):  
Neutron Diffraction ◽  
High Tc ◽  
High Tc Superconductor
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