The Particle Size Effect on the Irreversible Magnetization and Critical Current Density in Low Fields for Polycrystalline SmFeAsO0.91F0.09 Superconductors

2021 ◽  
Author(s):  
F. E. Sánchez-Zacate ◽  
A. Conde-Gallardo
Keyword(s):  
Particle Size ◽  
Critical Current Density ◽  
Size Effect ◽  
Critical Current ◽  
Current Density ◽  
Particle Size Effect ◽  
Irreversible Magnetization

Transport Critical Current Density and Flux Pinning Enhancement in Nano-Sized PbO and HfO2 Added (Bi1.6Pb0.4)Sr2Ca2Cu3O10 Superconductor

2015 ◽  
Vol 1108 ◽  
pp. 85-90
Author(s):  
Nabil A.A. Yahya ◽  
R. Abd-Shukor
Keyword(s):  
Particle Size ◽  
Transition Temperature ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Flux Pinning ◽  
Homogeneous Distribution ◽  
Transport Critical Current Density ◽  
Superconducting Properties ◽  
Pinning Centers

A comparative study on the effect of PbO (10-30 nm) and HfO2 (60-80 nm) additions on the superconducting properties of (Bi1.6Pb0.4)Sr2Ca2Cu3O10 ((Bi,Pb)-2223) superconductor in the bulk form was carried out. The structure and the microstructure of prepared samples were examined by powder XRD and SEM, respectively. The transition temperature Tc and critical current density Jc was determined by standard dc four-probe method. SEM micrographs showed a homogeneous distribution of Pb and Hf in the samples. It was observed that PbO and HfO2 additions enhanced Jc for all added samples. Jc was the highest for x= 0.05 wt. % of PbO (1130 mA/cm2 at 77 K and 1930 mA/cm2 at 30 K) and HfO2 (900 mA/cm2 at 77 K and 1760 mA/cm2 at 30 K) addition. This study showed that the addition of PbO and HfO2 nanopowder provided extra flux pinning centers in the (Bi, Pb)-2223. PbO with smaller particle size showed higher Jc compared with HfO2 which has a larger particle size.

INDUCTANCE TECHNIQUE FOR MEASURING TRANSITION TEMPERATURES OF SUPERCONDUCTING POWDERS

1989 ◽  
Vol 03 (05) ◽  
pp. 763-772 ◽  
Author(s):  
T. K. VETHANAYAGAM ◽  
W. A. SCHULZE ◽  
J. A. T. TAYLOR ◽  
R. L. SNYDER
Keyword(s):  
Particle Size ◽  
Critical Current Density ◽  
Sample Size ◽  
Critical Current ◽  
Current Density ◽  
Superconducting State ◽  
Simple Technique ◽  
Electrical Contacts ◽  
Powder Samples ◽  
Effect Of Particle Size

A simple technique to measure T c of superconducting powder samples is evaluated. Inductance of the sample is used as the indicator to determine the behavior of the material as it goes to the superconducting state. The effect of particle size and sample size on the measured parameters has been investigated. The main advantages of this technique are the absence of electrical contacts and the elimination of the need for sintered bars. The technique has the potential to measure the amount of superconducting phases as well as the critical current density.

MAGNETIZATION MEASUREMENTS IN THE 80 K TRANSFORMATION FOR DEUTERATED ORGANIC SUPERCONDUCTOR κ-(BEDT-TTF)2Cu[N(CN)2]Br

2013 ◽  
Vol 27 (05) ◽  
pp. 1350037 ◽  
Author(s):  
H. EL OUADDI ◽  
A. TIRBIYINE ◽  
A. TAOUFIK ◽  
A. RAMZI ◽  
A. HAFID ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Cooling Rate ◽  
Critical Current ◽  
Current Density ◽  
Vortex Lattice ◽  
Magnetic Measurements ◽  
Strong Dependence ◽  
Magnetic Behavior ◽  
Organic Superconductor ◽  
Irreversible Magnetization

In this paper, we report systematic magnetic measurements on deuterated organic superconductor (κ- D 8- Br )κ-( BEDT - TTF )2 Cu [ N ( CN )2] Br . The irreversibility line H irr (T) and the critical current density Jc were studied. Our results show the strong dependence of H irr (T) and Jc on the cooling rate. The structural transformation which occurs at the vicinity of 80 K very strongly influences the physics of vortex lattice and the associated magnetic behavior. The irreversible magnetization becomes null at H irr and vortices are not pinned; therefore they can displace more freely for an increase of the field or the temperature.

Critical current density, reversible and irreversible magnetization in YBa2Cu4O8 and Y0.9Ca0.1Ba2Cu4O8

1991 ◽  
Vol 173 (5-6) ◽  
pp. 337-341 ◽  
Author(s):  
I. Felner ◽  
B. Brosh ◽  
U. Yaron ◽  
Y. Yeshurun ◽  
E. Yacoby
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Irreversible Magnetization

Microstructural characterization of YBa2Cu3O7-x thin films formed by metalorganic CVD

1991 ◽  
Vol 49 ◽  
pp. 1080-1081
Author(s):  
P. Lu ◽  
W. Huang ◽  
C.S. Chern ◽  
Y.Q. Li ◽  
J. Zhao ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Film Growth ◽  
Chemical Vapor ◽  
Microstructural Characterization ◽  
Ion Milling ◽  
Conventional Grinding

The YBa2Cu3O7-x thin films formed by metalorganic chemical vapor deposition(MOCVD) have been reported to have excellent superconducting properties including a sharp zero resistance transition temperature (Tc) of 89 K and a high critical current density of 2.3x106 A/cm2 or higher. The origin of the high critical current in the thin film compared to bulk materials is attributed to its structural properties such as orientation, grain boundaries and defects on the scale of the coherent length. In this report, we present microstructural aspects of the thin films deposited on the (100) LaAlO3 substrate, which process the highest critical current density.Details of the thin film growth process have been reported elsewhere. The thin films were examined in both planar and cross-section view by electron microscopy. TEM sample preparation was carried out using conventional grinding, dimpling and ion milling techniques. Special care was taken to avoid exposure of the thin films to water during the preparation processes.

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