scholarly journals FLUX EXCHANGE IN INHOMOGENEOUS TYPE-II SUPERCONDUCTORS

2014 ◽  
Vol 28 (09) ◽  
pp. 1450030
Author(s):  
RONGCHAO MA
Keyword(s):  
Approximate Solutions ◽  
Internal Field ◽  
Type Ii ◽  
System Of Differential Equations ◽  
Approximate Methods ◽  
Geometrical Size ◽  
Type Ii Superconductors ◽  
Type Ii Superconductor ◽  
Strong Pinning ◽  
Application Fields

The vortex hopping motion in a type-II superconductor determines the current-carrying ability and consequently, the application fields of the superconductor. However, it is not clear how the vortices hop between the different pinning regions in the superconductor. Here, we proposed that there should be magnetic flux exchange between two contacting pinning regions. A system of differential equations was constructed to describe the flux exchange phenomenon. The qualitative analysis methods and approximate methods were used. The approximate solutions of the system were obtained. The results show that the flux exchange reduces the internal field in a weak pinning region, but increases the internal field in a strong pinning region. Moreover, the flux exchange is strongly influenced by the superconductor's geometrical size.

scholarly journals Campbell Response in Type-II Superconductors under Strong Pinning Conditions

2015 ◽  
Vol 115 (20) ◽  
Author(s):  
R. Willa ◽  
V. B. Geshkenbein ◽  
R. Prozorov ◽  
G. Blatter
Keyword(s):  
Type Ii ◽  
Type Ii Superconductors ◽  
Strong Pinning

μSR studies of type-II superconductors. Two-dimensional strong pinning

1991 ◽  
Vol 63 (1-4) ◽  
pp. 109-116 ◽  
Author(s):  
V. N. Gorbunov ◽  
V. P. Smilga
Keyword(s):  
Type Ii ◽  
Two Dimensional ◽  
Type Ii Superconductors ◽  
Strong Pinning

scholarly journals Strong-pinning regimes by spherical inclusions in anisotropic type-II superconductors

2017 ◽  
Vol 31 (1) ◽  
pp. 014001 ◽  
Author(s):  
R Willa ◽  
A E Koshelev ◽  
I A Sadovskyy ◽  
A Glatz
Keyword(s):  
Type Ii ◽  
Type Ii Superconductors ◽  
Spherical Inclusions ◽  
Strong Pinning

scholarly journals Experimental test of strong pinning and creep in current-voltage characteristics of type-II superconductors

2019 ◽  
Vol 100 (22) ◽  
Author(s):  
M. Buchacek ◽  
Z. L. Xiao ◽  
S. Dutta ◽  
E. Y. Andrei ◽  
P. Raychaudhuri ◽  
...  
Keyword(s):  
Experimental Test ◽  
Type Ii ◽  
Type Ii Superconductors ◽  
Current Voltage ◽  
Strong Pinning ◽  
Current Voltage Characteristics

scholarly journals Buckling instability in type-II superconductors with strong pinning

2000 ◽  
Vol 61 (17) ◽  
pp. 11700-11703 ◽  
Author(s):  
R. G. Mints ◽  
E. H. Brandt
Keyword(s):  
Type Ii ◽  
Buckling Instability ◽  
Type Ii Superconductors ◽  
Strong Pinning

scholarly journals Unveiling the vortex glass phase in the surface and volume of a type-II superconductor

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Jazmín Aragón Sánchez ◽  
Raúl Cortés Maldonado ◽  
Néstor R. Cejas Bolecek ◽  
Gonzalo Rumi ◽  
Pablo Pedrazzini ◽  
...  
Keyword(s):  
Structural Changes ◽  
Condensed Matter ◽  
Orientational Order ◽  
Vortex Matter ◽  
Type Ii ◽  
Vortex Glass ◽  
Type Ii Superconductors ◽  
Type Ii Superconductor ◽  
Comprehensive Survey ◽  
Bragg Glass

Abstract Order-disorder transitions between glassy phases are common in nature and yet a comprehensive survey on the entailed structural changes is challenging since the constituents are in the micro-scale. Vortex matter in type-II superconductors is a model system where some of these experimental challenges can be tackled. Samples with point disorder present a glassy transition on increasing the density of vortices. A glassy yet quasi-crystalline phase, the Bragg glass, nucleates at low densities. The vortex glass stable at high densities is expected to be disordered, however its detailed structural properties remained experimentally elusive. Here we show that the vortex glass has large crystallites with in-plane positional displacements growing algebraically and short-range orientational order. Furthermore, the vortex glass has a finite and almost constant correlation length along the direction of vortices, in sharp contrast with strong entanglement. These results are important for the understanding of disorder-driven phase transitions in glassy condensed matter.

scholarly journals Strong pinning theory of thermal vortex creep in type-II superconductors

2019 ◽  
Vol 100 (1) ◽  
Author(s):  
M. Buchacek ◽  
R. Willa ◽  
V. B. Geshkenbein ◽  
G. Blatter
Keyword(s):  
Type Ii ◽  
Type Ii Superconductors ◽  
Strong Pinning

Observations of strong pinning centers in Y-Ba-Cu-O

1991 ◽  
Vol 49 ◽  
pp. 1094-1095
Author(s):  
J. P. Zhang ◽  
D. J. Li ◽  
L. D. Marks ◽  
C. H. Lin ◽  
J. A. Eades
Keyword(s):  
Size Effect ◽  
Flux Pinning ◽  
Critical Issue ◽  
Type Ii ◽  
Interesting Point ◽  
Pinning Centers ◽  
Type Ii Superconductors ◽  
Strong Pinning ◽  
Size And Morphology

Using additional Y (or Cu) nitrate we had been successful in production of Y-enriched 123 (YBa2Cu3O7-x) as well as Cu-enriched ones. The magnetic Jc at 77K is 106 (B=0) and 105 (B=1 Tesla). A critical issue is the understanding flux pinning in terms of defects in microstructure.Precipitates were observed inside of the 123 crystal as shown in Fig. 1. These precipitated slabs are usually 3 - 10 nm long along c axis of 123 and 101 - 102 nm in the a-b plane, similar to that reported in CVD films. An interesting point is the precipitates found in both Yenriched and Cu-enriched samples have similar size and morphology. It is reasonable to assume those precipitates are the strong pinning centers for the size effect as known in type II superconductors. In the 123 compound the coherent length is about 2∼3 angstrom in the c direction and 16∼30 angstrom in the a-b plane.

scholarly journals Vortex dynamics in type-II superconductors under strong pinning conditions

2017 ◽  
Vol 96 (14) ◽  
Author(s):  
A. U. Thomann ◽  
V. B. Geshkenbein ◽  
G. Blatter
Keyword(s):  
Vortex Dynamics ◽  
Type Ii ◽  
Type Ii Superconductors ◽  
Strong Pinning
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