On the Determination of Pinning Mechanisms and Regimes in Type-II Superconductors with Weak Thermal Fluctuations

2019 ◽  
Vol 33 (4) ◽  
pp. 971-980 ◽  
Author(s):  
Mohammad Hosseinzadeh ◽  
Shaban Reza Ghorbani ◽  
Hadi Arabi
Keyword(s):  
Thermal Fluctuations ◽  
Type Ii ◽  
Type Ii Superconductors

Determination of the pinned vortex fraction in type-II superconductors

2006 ◽  
Vol 3 (9) ◽  
pp. 3093-3095
Author(s):  
A. Bouaaddi ◽  
A. Taoufik ◽  
A. Labrag ◽  
M. Bghour ◽  
A. Abaragh ◽  
...  
Keyword(s):  
Type Ii ◽  
Type Ii Superconductors

EFFECTS OF QUANTUM AND THERMAL FLUCTUATIONS ON COLLECTIVE PINNING AND CRITICAL CURRENT DENSITY IN TYPE-II SUPERCONDUCTING BULK MATERIALS

2011 ◽  
Vol 25 (04) ◽  
pp. 609-618
Author(s):  
MING JU CHOU ◽  
HERNG ER HORNG
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Thermal Fluctuations ◽  
Quantum Limit ◽  
Type Ii ◽  
Type Ii Superconductors ◽  
Collective Pinning ◽  
Fluctuation Temperature ◽  
Increasing Temperature

The effects of quantum and thermal fluctuations on collective pinning and critical current density Jc are investigated for bulk type-II superconductors by utilizing quantum statistics. It is shown that for a constant magnetic field, Jc is nearly independent of temperature in the quantum limit; however, in the classical limit, Jc decreases weakly with increasing temperature when T < Tdp (depinning temperature); when Tdp < T < Tf (boundary fluctuation temperature), Jc is power-law-decaying, and when T > Tf, Jc decays exponentially. For constant temperature, Jc first decreases, then increases after reaching a maximum, and finally decreases again. These results are in agreement with the experiments.

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