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On flux pinning by point pinning centres in Type‐II superconductors
Author(s) -
Schmucker R.,
Brandt E. H.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220790210
Subject(s) - physics , condensed matter physics , flux pinning , superconductivity , type ii superconductor , lattice (music) , pinning force , flux (metallurgy) , type (biology) , line (geometry) , critical current , chemistry , mathematics , geometry , organic chemistry , acoustics , ecology , biology
The maximal flux line displacement s(O) caused by a point force is calculated from the correct elastic properties of the flux line lattice, which were derived in a provioous paper. For bx 2 > (1 b)(x Ginsburg‐Landau parameter, b B/H c2 reduced induction) non‐local effects become important and lead to an s(O) larger than the result of local theory of elasticity by a factor \documentclass{article}\pagestyle{empty}\begin{document}$ {x \sqrt {b/2(1 - b)} }$\end{document} or even more. As a consequence, the volume pinning force P v for a depinning process becomes larger by this factor. In particular, near H< c2 , P v ∼ \documentclass{article}\pagestyle{empty}\begin{document}$ {\sqrt {1 - b} }$\end{document} is obtained rather than P v ∼(1 − b) as obtained by previous authors.