Abstract
The Meissner state of a 3D Josephson medium is analyzed for stability against small fluctuations of phase discontinuities at contacts. For any form of fluctuations, there exists value I 0 of pinning parameter I such that the Meissner configuration remains stable if I < I 0. Reasons why the configuration remains stable at small I are considered. Instability arises when the quadratic form of the second variation of Gibbs potential G is not a positively definite quantity. At small I, the contribution of the Josephson energy to G is small. The second variation of the magnetic energy, the other component of G, is always a positively definite quadratic form. Therefore, instability may arise only if I has a finite value. This statement holds true not only for the Meissner but also for any equilibrium configuration. At I < I 0, stability persists up to the boundary of the Meissner state. Then, a sequence of plane vortices parallel to the boundary appears throughout the sample. Thus, vortices appearing at I < I 0 are plane vortices rather than linear. The configurations of currents and the magnetic field profile inside the sample are calculated for I < I 0. Calculation is based on analyzing the continuous variation of the current configuration toward a decrease in the Gibbs potential.
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Original Russian Text © M.A. Zelikman, 2010, published in Zhurnal Tekhnicheskoĭ Fiziki, 2010, Vol. 80, No. 11, pp. 41–48.
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Zelikman, M.A. Penetration of the magnetic field into a 3D ordered Josephson medium at very small values of the pinning parameter. Tech. Phys. 55, 1588–1595 (2010). https://doi.org/10.1134/S1063784210110071
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DOI: https://doi.org/10.1134/S1063784210110071