Flux Line Pinning by Large Normal Particles in Type-II Superconductors

1972 ◽  
Vol 50 (5) ◽  
pp. 421-427 ◽  
Author(s):  
R. I. Coote ◽  
J. E. Evetts ◽  
A. M. Campbell
Keyword(s):  
Phase Boundary ◽  
Flux Line ◽  
Experimental Results ◽  
Flux Creep ◽  
Type Ii ◽  
Line Lattice ◽  
Flux Line Lattice ◽  
Type Ii Superconductors ◽  
Flux Lines ◽  
Direct Summation

The pinning of flux lines by large normal particles has been investigated as a function of field and temperature. The results are compared with a model for the magnetic pinning interaction at a phase boundary. The problem of the summation procedure for individual pinning interactions is discussed and it is concluded that the distortion of the flux line lattice caused by large normal particles is large enough for a simple direct summation to apply. This conclusion is supported by the experimental results. The experimental results also indicate that Anderson flux creep is not significant in this type of pinning system.

COMPUTER SIMULATIONS ON MELTING PHENOMENA OF QUANTIZED FLUX LINES IN TYPE-II SUPERCONDUCTORS

2003 ◽  
Vol 17 (01n02) ◽  
pp. 55-61
Author(s):  
XIAO HU ◽  
QING-HU CHEN
Keyword(s):  
Large Scale ◽  
Flux Line ◽  
Type Ii ◽  
Line Lattice ◽  
Glass Melts ◽  
Type Ii Superconductors ◽  
First Order ◽  
Flux Lines ◽  
Bragg Glass ◽  
The Magnetic Field

Large scale Monte Carlo simulations are performed in order to clarify thermodynamic properties of vortex states of extremely type-II, layered superconductors. The first-order normal to superconductivity transition is observed accompanied by the melting of the flux-line lattice. If the magnetic field is applied parallel to the layer, there exists a critical field above which the melting becomes continuous. Dynamics of current-driven vortices in a random potential has also been investigated and it is found that for certain currents the moving Bragg glass melts first into moving smectic and then to liquid.

ELASTIC-THEORY STUDY ON THE MELTING TRANSITION OF FLUX LINE LATTICE INDUCED BY MAGNETIC FIELDS PERPENDICULAR TO THE ANISOTROPIC AXIS

2005 ◽  
Vol 19 (01n03) ◽  
pp. 475-477
Author(s):  
QING-MIAO NIE ◽  
MENG-BO LUO ◽  
QING-HU CHEN ◽  
XIAO HU
Keyword(s):  
Magnetic Fields ◽  
Flux Line ◽  
Elastic Theory ◽  
Melting Transition ◽  
Type Ii ◽  
Line Lattice ◽  
Flux Line Lattice ◽  
Type Ii Superconductors ◽  
Special Value ◽  
Lindemann Criterion

The melting transition in anisotropic type-II superconductors has been studied by the Lindemann criterion in the framework of elastic theory. Using two Lindemann numbers for two transverse directions, we find that the single melting transition can be obtained, when the ratio between the two Lindemann numbers reaches special value.

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