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- W1976470791 abstract "Abstract he critical current of individual intergrain contacts in HTSC ceramics defining its transport critical current depends on the “construction” of these contacts and, in particular, on their geometry. We analyze the current-carrying properties of intercrystallite tilt boundaries in terms of the dislocation model of such boundaries, proceeding from the assumption of substantial suppression of the order parameter by local mechanical stresses arising in the vicinity of the boundary. The spatial distribution of stresses depends on the misorientation angle θ of adjacent grains and the orientation angle φ of the boundary. Calculations reveal mechanical stresses on the asymmetrical boundary ( φ ≠0) to be on the average weaker than on the symmetrical one ( φ =0). It must lead to the increase of the current-carrying capacity of asymmetrical boundaries. The results obtained with regard to this circumstance describe much better the experimental dependences of the tilt boundary critical current on the misorientation angle θ. Another peculiarity of the asymmetrical boundary, that is a “random” character of the spatial distribution of stresses, leads to a random distribution of the critical current local density over the contact area. For such (Josephson) contacts the magnetic field dependence of the critical current is a double-step one which allows one to explain experimentally observable double-step magnetic field dependences of the transport critical current of a good number of HTSC ceramics." @default.
- W1976470791 created "2016-06-24" @default.
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- W1976470791 date "1994-06-01" @default.
- W1976470791 modified "2023-10-18" @default.
- W1976470791 title "Intergrain boundary asymmetry and the critical current of HTSC ceramics" @default.
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- W1976470791 doi "https://doi.org/10.1016/0921-4534(94)90479-0" @default.
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