Which outcome sharply decreases superconducting transition temperature when impurities enter a crystalline lattice?

💡 Explanation

Superconducting transition temperature decreases due to electron pairing disruption via crystal lattice symmetry breaking scattering, because lattice symmetries alter order parameters of the Cooper pairs. Therefore, answer A weakens superconductivity, rather than enhancing or not interacting such as options B, C and D under impurity conditions.

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