THE INFLUENCE OF JOSEPHSON JUNCTIONS ON THE DYNAMICAL CURRENT-VOLTAGE ANOMALIES IN CERAMIC SUPERCONDUCTORS

1994 ◽  
Vol 08 (23) ◽  
pp. 1447-1452
Author(s):  
J. SOSNOWSKI
Keyword(s):  
Magnetic Properties ◽  
High Temperature ◽  
Transport Current ◽  
Ceramic Superconductors ◽  
Current Voltage ◽  
Josephson Junction Array ◽  
Model Predictions ◽  
Junction Array ◽  
Current Voltage Characteristics ◽  
The Magnetic Field

The influence of Josephson junction array on the dynamical current-voltage anomalies and magnetic properties of high temperature ceramic superconductors is analyzed. The influence of vortices penetrating the junction regions on the macroscopic current flowing through the sample is considered. In the case of zero transport current the existence of vortices modifies the magnetic field dependence of the screening currents and such magnetic properties as the shape of magnetization curves. In the case of transport current flow the existence of junctions may lead to a new critical state approach the consequences of which are anomalies of the dynamical current-voltage characteristics. Comparison of the theoretical model predictions with experimental data measured on high temperature ceramics of various composition is made.

scholarly journals Simulated radiation effects in the superinsulating phase of titanium nitride films

2011 ◽  
Vol 26 (3) ◽  
pp. 254-260 ◽  
Author(s):  
Milos Vujisic ◽  
Dusan Matijasevic ◽  
Edin Dolicanin ◽  
Predrag Osmokrovic
Keyword(s):  
Titanium Nitride ◽  
Josephson Junction ◽  
Radiation Effects ◽  
Ion Beam ◽  
Material Structure ◽  
Pair Tunneling ◽  
Current Voltage ◽  
Josephson Junction Array ◽  
Radiation Induced ◽  
Junction Array

This paper investigates possible effects of alpha particle and ion beam irradiation on the properties of the superinsulating phase, recently observed in titanium nitride films, by using numerical simulation of particle transport. Unique physical properties of the superinsulating state are considered by relying on a two-dimensional Josephson junction array as a model of material structure. It is suggested that radiation-induced change of the Josephson junction charging energy would not affect the current-voltage characteristics of the superinsulating film significantly. However, it is theorized that a relapse to an insulating state with thermally activated resistance is possible, due to radiation-induced disruption of the fine-tuned granular structure. The breaking of Cooper pairs caused by incident and displaced ions may also destroy the conditions for a superinsulating phase to exist. Finally, even the energy loss to phonons can influence the superinsulating state, by increasing the effective temperature of the phonon thermostat, thereby reestablishing means for an energy exchange that can support Cooper pair tunneling.

SUPERCONDUCTING CABLES – ANALYSIS OF THEIR OPERATION AND APPLICATIONS IN ELECTRIC GRIDS

2016 ◽  
Vol 63 (0) ◽  
pp. 89-96
Author(s):  
Jacek SOSNOWSKI
Keyword(s):  
High Temperature ◽  
Liquid Nitrogen ◽  
Electrical Energy ◽  
Cable Model ◽  
Barrier Formation ◽  
Current Voltage ◽  
Electric Grids ◽  
Pinning Potential ◽  
Current Voltage Characteristics ◽  
Superconducting Cables

In this paper the use of high temperature superconducting cables for transporting electrical energy is analysed. The construction of a short model of a superconducting cable is explained, global progress in this field is examined and related electromagnetic phenomena are discussed, particularly those concerning pinning potential barrier formation. The paper analyses the results of investigations into the current-voltage characteristics of superconducting cable model working in the temperature of liquid nitrogen, allowing to reach the value of critical current equal to 45 A.

SUPERCONDUCTIVITY ASSOCIATED WITH THE GRANULAR STRUCTURE IN Ba2YCu3O7−δ

1988 ◽  
Vol 02 (08) ◽  
pp. 1011-1015
Author(s):  
YONG ZHAO ◽  
QIRUI ZHANG ◽  
WEIYAN GUAN ◽  
JIANSHENG XIA ◽  
ZHENHUI HE ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Transport Properties ◽  
Single Phase ◽  
Granular Structure ◽  
Current Voltage ◽  
Granular Superconductivity ◽  
Current Voltage Characteristics ◽  
The Magnetic Field ◽  
Nonmonotonic Behavior

The dependence of the resistance on the magnetic field and the current-voltage characteristics of the single phase Ba 2 YCu 3 O 7−δ have been measured. The nonmonotonic behavior and a hysteresis of R(H) and the current-voltage characteristics suggest that the granular superconductivity exist in this material, and it plays an important role in transport properties.

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