scholarly journals First VAMAS USA interlaboratory comparison of high temperature superconductor critical current measurements

1995 ◽  
Vol 5 (2) ◽  
pp. 552-555 ◽  
Author(s):  
L.F. Goodrich ◽  
J.A. Wiejaczka ◽  
A.N. Srivastava ◽  
T.C. Stauffer ◽  
L.T. Medina
Keyword(s):  
High Temperature ◽  
Critical Current ◽  
High Temperature Superconductor ◽  
Interlaboratory Comparison

Current sharing between the metallic and superconducting layers of high temperature superconductor coated conductors operated above their critical current

2011 ◽  
Vol 109 (3) ◽  
pp. 033915 ◽  
Author(s):  
Pierre Bernstein ◽  
Conor McLoughlin ◽  
Yohann Thimont ◽  
Frédéric Sirois ◽  
Jonathan Coulombe
Keyword(s):  
High Temperature ◽  
Critical Current ◽  
High Temperature Superconductor ◽  
Coated Conductors ◽  
Current Sharing

Electron irradiation effects in doped high temperature superconductors YBa2Cu3−x MxOy (M = Fe, Ni; x=0; x=0:01)

Open Physics ◽  
2008 ◽  
Vol 6 (4) ◽  
Author(s):  
Aram Sahakyan ◽  
Sergei Nikoghosyan ◽  
Hrant Yeritsyan
Keyword(s):  
High Temperature ◽  
Critical Current ◽  
Irradiation Dose ◽  
High Temperature Superconductor ◽  
Defect Formation ◽  
Weak Link ◽  
High Temperature Superconductors ◽  
Large Change ◽  
Impurity Doped ◽  
Intergranular Critical Current Density

AbstractThe influence of irradiation by electrons with an energy of 8 MeV, at dose intervals between 1013 and 2×1018el/cm2, on the properties of impurity doped, high-temperature superconductor YBa2Cu3−x MxOy (M = Fe, Ni; x=0; x=0:01) ceramics has been studied.It has been established that, as the irradiation dose is increased, the onset temperature of the transition to the superconducting state (T con), and the intergranular weak link coupling temperature between granules (T mJ), exhibit an oscillation around their initial values of approximately about 1–1.5 K. This oscillation indicates that the process of radiation defect formation in HTSC occurs in multiple stages. It was also found that the critical current (J c)decreases with an increase of the irradiation dose, and exhibits a local minimum at a dose of 8×1016el/cm2coinciding with minima for T con and T mJ at this dose. It was found that the introduction of Fe atoms to the ceramic decreases T mJ, while introducing Ni atoms decreases both T con and T mJ; it is suggested that this is a result of Ni substitution of Cu both in Cu2 plane sites and Cu1 chain sites. The introduction of Ni causes a large change in the intergranular critical current density, J c. A critical irradiation dose is obtained (2×1018)after which all HTSC parameters strongly decrease, i. e. the superconductivity of HTSC is destroyed.

Standard reference devices for high temperature superconductor critical current measurements

Cryogenics ◽  
1993 ◽  
Vol 33 (12) ◽  
pp. 1142-1148 ◽  
Author(s):  
L.F. Goodrich ◽  
A.N. Srivastava ◽  
T.C. Stauffer
Keyword(s):  
High Temperature ◽  
Critical Current ◽  
High Temperature Superconductor

scholarly journals Механизм формирования критического тока высокотемпературных сверхпроводников, содержащих сквозные микроскопические дефекты

2021 ◽  
Vol 63 (1) ◽  
pp. 65
Author(s):  
А.Н. Максимова ◽  
В.А. Кашурников ◽  
А.Н. Мороз ◽  
И.А. Руднев
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Magnetic Flux ◽  
Critical Current ◽  
High Temperature Superconductor ◽  
Physical Mechanism ◽  
Characteristic Size ◽  
Pinning Centers ◽  
The Magnetic Field ◽  
Qualitative Picture

The critical current of a model high-temperature superconductor (HTSC) with defects in the form of through holes (antidots) with a characteristic size greater than or of the order of the penetration depth of the magnetic field is calculated. To do this, the subprocesses equivalent to the trapping of the magnetic flux by the hole and the creation of a vortex at the edge of the hole are introduced into the model of layered HTSC. It is shown that accounting for these subprocesses leads to the appearance of a physical mechanism that allows us to correctly describe the non-monotonic dependence of the critical current on the characteristic size of the antidot, similar to that observed in the experiment. Calculations were performed for a pure superconductor and a superconductor containing nanoscale pinning centers. It is shown that the presence of nanoscale pinning centers along with antipoints does not change the qualitative picture of the influence of the antidot radius on the pinning character of the magnetic flux and the behavior of the critical current in the HTSC.

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