scholarly journals Modification of the Bean Critical-State Model with Surface Barriers and Lower Critical Fields.

1997 ◽  
Vol 44 (2) ◽  
pp. 168-172
Author(s):  
Shinjiro Tochihara ◽  
Hiroshi Yasuoka ◽  
Hiromasa Mazaki
Keyword(s):  
Critical State ◽  
Critical State Model ◽  
State Model ◽  
Critical Fields ◽  
Surface Barriers

On the Determination of Intrinsic Properties of Ceramic High-Tc Superconductors by Ac Susceptibility Measurements

1992 ◽  
Vol 275 ◽  
Author(s):  
F. Ludwig
Keyword(s):  
Sample Size ◽  
Critical State ◽  
Ac Susceptibility ◽  
Field Amplitude ◽  
Critical State Model ◽  
State Model ◽  
Critical Fields ◽  
Current Densities ◽  
Ac Field

ABSTRACTVarious models have been proposed to interpret ac susceptibility curves measured on sintered high-To superconductors (HTSC) and to deduce parameters like critical current densities and critical fields. To get more clearness, systematic studies of position and height of the intergranular maximum in χ'' have been performed on several ceramic HTSC samples in dependence of both ac field amplitude and sample size. In the present paper, the data are used to discuss the various models proposed in the literature. It is shown that modifications of the critical state model using incorrect jc(Hi) functions as well as other interpretations of the χ'' peak yield not actually intrinsic but sample size and geometry dependent parameters. The dependence of both position and height of the intergranular maximum in χ '' on ac field amplitude and sample size can be explained in the framework of a modified critical state model using a power law for the jc(Hi) dependence.

CRITICAL STATE MODEL FOR CUPRATE SUPERCONDUCTORS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-2231-C8-2232
Author(s):  
A. M. Portis ◽  
M. Stalder ◽  
G. Stefanicki ◽  
F. Waldner ◽  
M. Warden
Keyword(s):  
Critical State ◽  
Cuprate Superconductors ◽  
Critical State Model ◽  
State Model

On the applicability of the critical state model to the description of electromagnetic properties of high-Tc superconductors

1993 ◽  
Vol 206 (3-4) ◽  
pp. 195-201 ◽  
Author(s):  
L.M. Fisher ◽  
N.V. Il'in ◽  
I.F. Voloshin ◽  
N.M. Makarov ◽  
V.A. Yampol'skii ◽  
...  
Keyword(s):  
Critical State ◽  
Critical State Model ◽  
State Model ◽  
Electromagnetic Properties ◽  
High Tc Superconductors ◽  
High Tc
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