scholarly journals MEASURING INSTALLATION FOR DETERMINING CURRENT-VOLTAGE CHARACTERISTICS OF COMPOSITE SUPERCONDUCTORS IN THE PRODUCTION OF CRYOGENIC TECHNIQUE

2020 ◽  
Vol 8 (2) ◽  
pp. 38-41
Author(s):  
Alexander F. Brodnikov
Keyword(s):  
Critical Current ◽  
Ti Alloy ◽  
Composite Wire ◽  
Rectangular Section ◽  
Measuring Installation ◽  
Cryogenic Technique ◽  
Current Voltage ◽  
Composite Superconductors ◽  
Current Voltage Characteristics

The method and measuring installation for determining the actual critical current values in superconductors, at helium temperatures, coming to the market from domestic and foreign manufacturers of composite wire, round or rectangular section, based on the Nb-Ti alloy, are considered.

Current–voltage characteristics of ionic liquid–air glow discharges

2013 ◽  
Vol 79 (5) ◽  
pp. 559-567 ◽  
Author(s):  
T. ABDUL KAREEM ◽  
A. ANU KALIANI
Keyword(s):  
Ionic Liquid ◽  
Glow Discharge ◽  
Critical Current ◽  
Ohm’S Law ◽  
Glow Discharges ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Ohm's Law

AbstractI–V characteristics of air glow discharge, ionic liquid–contact air glow discharge and ionic liquid–air glow discharge are presented and photographs of the discharges are shown. It is found that the I–V characteristics of the air glow discharge always obey Ohm's law but I–V characteristics of the ionic liquid–contact air glow discharge and ionic liquid–air glow discharge obey Ohm's law only up to a particular voltage. A sudden burst of the electrolyte is observed for currents above a critical current.

TUNNELING CHARACTERISTICS OF INTRINSIC JOSEPHSON JUNCTIONS IN (Bi1-xPbx)2Sr2CaCu2Oy SINGLE CRYSTALS

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3718-3720 ◽  
Author(s):  
GIN-ICHIRO OYA ◽  
SHINNOSUKE NOZAWA ◽  
AKINOBU IRIE
Keyword(s):  
Single Crystals ◽  
Critical Current ◽  
Strong Correlation ◽  
Josephson Junctions ◽  
Josephson Tunneling ◽  
Intrinsic Josephson Junctions ◽  
Current Voltage ◽  
Structural Modulation ◽  
Current Densities ◽  
Current Voltage Characteristics

We have studied the current-voltage characteristics of intrinsic Josephson junctions in mesa-shaped Bi 2 Sr 2 CaCu 2 O y and ( Bi 1-x Pb x)2 Sr 2 CaCu 2 O y single crystals as a function of x. Pronounced Josephson tunneling characteristics, which are characterized by high critical current densities and multiple quasiparticle branches with clear subgap structures, have been observed for ( Bi ~0.8 Pb ~0.2)2 Sr 2 CaCu 2 O y. A strong correlation between the characteristics and structural modulation in this system has been found.

Critical Current Densities JC(H,T) and Current-Voltage Characteristics in Melt Processed Bi-2212 with and without Preferential Orientation

1992 ◽  
Vol 275 ◽  
Author(s):  
W. Paul ◽  
B. Heeb ◽  
Th. Baumann ◽  
M. Guidolin ◽  
L. J. Gauckler
Keyword(s):  
Critical Current ◽  
Bulk Material ◽  
Critical Currents ◽  
Zone Melting ◽  
Processed Material ◽  
Current Voltage ◽  
Small Fields ◽  
Current Densities ◽  
Current Voltage Characteristics

ABSTRACTIn contrast to sintered Bi2Sr2Ca1Cu2Oy (Bi-2212), melt processed material exhibits nonzero intergrain supercurrents at T < 77 K. By means of partial melting and long term annealing we achieved nonoriertted material with Jc(77) - 3500 A/cm2 (1μV/cm criterion) and Tc = 96 K. Zone melting leads to well textured bulk material with the c-axis of the crystallites oriented perpendicular to the pulling direction R, and thus to an anisotropie critical current density. The anisotropy factor is between 2 and 5. At low temperatures the melt textured ceramic exhibits higher critical currents than the nonoriented material. This is not true at high temperatures, since the latter has a higher critical temperature.At 77 K and small fields both oriented and nonoriented ceramics exhibit no transition in their current-voltage characteristics, but obey the power law E = Eo(j/jo(H)) α(H) over a large range in E (10”−3-10”−3 V/cm). Measurements on the textured ceramic with magnetic fields parallel and perpendicular to the pulling direction demonstrate that the superconducting properties of these materials are only affected by the field components parallel to the c-axes of the crystallites. For fields parallel to the pulling direction the measured values of α(H), Jo(H) and of the reversible magnetization Mrev can be attributed to the misorientation of the Bi-2212 platelets which is in average about 14°.

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