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Effect of the magnetic flux trapping upon the temperature dependence of the flow stress change at the superconducting transition
Author(s) -
Dotsenko V. I.,
Pustovalov V. V.,
Sirenko V. A.,
Fomenko V. S.
Publication year - 1984
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170190803
Subject(s) - trapping , condensed matter physics , flux (metallurgy) , superconductivity , flow stress , materials science , atmospheric temperature range , magnetic flux , transition temperature , flux pinning , stress (linguistics) , thermodynamics , superconducting transition temperature , magnetic field , strain rate , high temperature superconductivity , physics , metallurgy , ecology , linguistics , philosophy , quantum mechanics , biology
Abstract The effect of the superconducting transition on the flow stress in single and polycrystals of Pb‐In and Pb‐Sn alloys has been studied in the temperature range 1.8 K to T e . Unlike earlier efforts, these experiments involved investigation of the magnetic flux trapping. Two types of temperature dependences of the magnetic flux trapping, B 0 ( T ), were revealed. In Pb‐1.9 at.% In and Pb‐6 at.% Sn alloys (subjected to various thermal treatment), B 0 monotonically rises with lowering temperature. In Pb‐1.8, 3 at.% Sn single crystals the flux trapping arises at high strains (> 50%) and low temperatures (<2.5 K). In this case B 0 magnitude depends on the strain rate. The difference in the B 0 ( T ) behaviour is associated with dissimilar flux pinnig by pinning centres. The date on B 0 ( T ) obtained give an insight into the two types of the Δσ( T ) dependences; taking into account of the flux trapping allowed the Δσ values to be corrected, so that as a result, a single Δσ SN ( T ) curve was obtained for all the alloys and structures studied.