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← ScienceWhich mechanism suppresses superconductivity when a magnetic field exceeds a critical value in niobium?
A)Pair breaking via Zeeman splitting✓
B)Increased electron-phonon scattering
C)Formation of magnetic domains
D)Shift in Fermi level
💡 Explanation
Superconductivity is suppressed by pair breaking via Zeeman splitting because unpaired electrons introduce normal conductivity; therefore, superconductivity vanishes rather than remaining stable because of disruptive magnetic field effects on paired electrons.
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