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Which mechanism causes increased conductivity when cooling certain perovskite materials?

A)Polaron delocalization enables wider band transport
B)Reduced piezoelectricity diminishes electron scattering
C)Increased ferromagnetism improves spin alignment
D)Enhanced pyroelectricity increases charge separation

💡 Explanation

Polaron delocalization creates electronic band widening that enables wider band transport because electrons behave as free carriers within a wide and smooth potential, rather than strongly localized bound state. Therefore conductivity increases, rather than diminishes with piezoelectricity.

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