At what factor Resistance R of a conductor depends?

R = p L (1 + αT) / A ohms where p is resistivity in ohms per cm cube, L cm is the length, A in cm2 is the cross sectional area, α is temp co-efficient and T is the temperature in degrees Celsius.
Several sources give Copper p = 1.7 * 10-6 ohms per cm cube and α = 0.004. At very low Temperatures, the resistance of some materials falls to zero

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