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

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

Analysis of the critical current density and flux pinning properties in iron-based Ba0.55K0.45Fe2As2 high-T c superconductor

2013 ◽  
Vol 62 (12) ◽  
pp. 2011-2015
Author(s):  
Dawood Ahmad ◽  
I. S. Park ◽  
G. C. Kim ◽  
Rock KilKo ◽  
J. H. Lee ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Flux Pinning ◽  
Iron Based ◽  
Pinning Properties

scholarly journals MAGNETIC FLUX PINNING AND CREEP IN (BiPb)-Sr-Ca-Cu-O 2223 PHASE HIGH-Tc SUPERCONDUCTOR

1991 ◽  
Vol 40 (4) ◽  
pp. 630
Author(s):  
JIN XIN ◽  
ZHANG YI-TONG ◽  
LU MU ◽  
ZHANG CHANG-GUI ◽  
YAN YONG ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Flux Pinning ◽  
High Tc ◽  
High Tc Superconductor ◽  
Magnetic Flux Pinning

Mechanical Behaviors of Flux Pinning in GdxY1−x-Ba2Cu3Oy

1992 ◽  
Vol 275 ◽  
Author(s):  
J. S. Zhu ◽  
J. Li ◽  
X. M. Lu ◽  
X. Jin ◽  
M. Gu ◽  
...  
Keyword(s):  
Flux Pinning ◽  
Magnetic Hysteresis ◽  
Rare Earth Ions ◽  
Vibrating Sample Magnetometer ◽  
Mechanical Behaviors ◽  
Mechanical Measurement ◽  
High Tc ◽  
High Tc Superconductor ◽  
Vibrating Reed ◽  
Practicable Method

ABSTRACTThe mechanical behaviors of flux pinning in GdxY1−xBa2Cu3Oy with various concentration of Gd were studied comparatively by means of a vibrating reed technique. Both the internal friction and the modulus increased with enhanced flux pinning due to the increasing of Gd content in GdxY1−xBa2Cu3Oy. It was in accordance with the results of the magnetic hysteresis measurements using a vibrating sample magnetometer. These results indicated that the substitution of magnetic rare-earth ions is a practicable method for improving the flux pinning in high Tc superconductor and the mechanical measurement of flux pinning as a judgement for the superconductivity of sample was proved.

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