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Which restriction arises which inhibits superconductivity in niobium alloys?

A)Phonon bottleneck exceeds Debye frequency
B)External magnetic field surpasses Hc2
C)Umklapp scattering reduces carrier mobility
D)Interstitial defects elevate residual resistivity

💡 Explanation

The upper critical field (Hc2) limits superconductivity because type-II superconductors transition to a mixed state above Hc1 and become fully normal at Hc2; therefore, the magnetic field surpasses Hc2 rather than lower values or lattice imperfections.

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