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0 andn

0), are studied. The field increase (FI) and the field decrease (FD) regimes are studied. The critical fields destroying the SC state withm=1 are found in both regimes. It is shown that in a cylinder of radiusR and GL-parameter ϰ, there exist a number of solutions depending only on the radial co-ordinater corresponding to different states such as M,e, d, p,i, n,

$$\bar n$$

,n

*, and the state diagram on the plane of the variables (ϰ,R) is described. The critical fields corresponding to intrastate transitions and the onset of hysteresis are obtained. The critical fieldH

0(R) dividing the paramagnetic and diamagnetic states of the cylinder withm=1 is determined. The limiting fields of supercooling or superheating of the normal state at which the restoration of the SC state occurs are established. It is shown, that (in both casesm=1,0) there exist two critical parameters,

$$\kappa _0 = {1 \mathord{\left/ {\vphantom {1 {\sqrt 2 = 0.707}}} \right. \kern-\nulldelimiterspace} {\sqrt 2 = 0.707}}$$

and

$$\kappa _0 = 0.93$$

, which divide bulk SC into three groups (with

$$\kappa< \kappa _0 ,\kappa _0 \leqslant \kappa \leqslant \kappa _c $$

and

$$\kappa > \kappa _c $$

), in accordance with the behavior in a magnetic field. The parameters

$$\kappa _0 $$

and

$$\kappa _c $$

mark the boundary for the existence of a supercooled normal

$$\bar n$$

-state in FD-regime and a superheated SC M-state in FI-regime respectively. It is shown, that the value

$$\kappa _* = 0.417$$

, which was claimed in a number of papers as related to type-I superconductors, is illusory.

Journal

Year

Volume

Issue

Pages

77-103

Physical description

Dates

published

1 - 3 - 2005

online

1 - 3 - 2005

Contributors

author

- P.N. Lebedev Physical Institute, Russian Academy of Sciences, Leninsky pr., 53, 119991, Moscow, Russia

References

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Publication order reference

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YADDA identifier

bwmeta1.element.-psjd-doi-10_2478_BF02476508