A sample is never pure. As a result there is always a residual resistivity as one approaches the absolute zero temperature. A measure of the purest Na samples available gives a room-temperature conductivity of sigma RT 2.0 times 107 Omega 1m1 and a residual conductivity at T 1K (that is T = 0 for our purposes) of sigma 0 5.3

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A sample is never pure. As a result there is always a residual resistivity as one approaches the absolute zero temperature. A measure of the purest Na samples available gives a room-temperature conductivity of  sigma RT  2.0 times 107  Omega 1m1 and a residual conductivity at T  1K (that is T = 0  for our purposes) of  sigma 0  5.3  times  1010  Omega 1m1.

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