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Which mechanism terminates superconductivity when a magnetic field exceeds a critical strength at fixed temperature?

A)Cooper pair symmetry breaking
B)Fermi level depopulation
C)Phonon scattering enhancement
D)Crystal lattice dislocation formation

💡 Explanation

Superconductivity ceases due to Cooper pair symmetry breaking above a critical magnetic field, because the energy gained from the field exceeds the binding energy. Therefore, the pairs unbind, rather than increased phonon scattering or lattice defects which influence resistance differently.

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