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← ScienceWhich mechanism causes increased electrical resistance when a superconducting crystal grain boundary is subjected to high current density?
A)Andreev reflection reduction
B)Flux pinning enhancement
C)Josephson junction dissipation✓
D)Phonon scattering suppression
💡 Explanation
When a high current exceeds the critical current density at grain bounaries, the Josephson junctions switch to a resistive state because resistive dissipation occurs at the grain boundary, therefore the resistance increases, rather than remaining in SC state.
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