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Abstract
We use the time-dependent Ginzburg-Landau equation to calculate the effect of thermodynamic fluctuations in lowering the resistance below the normal state value for magnetic fields above a second-order critical field. We consider only dirty metals in the Ginzburg-Landau temperature region and evaluate the conductivity of a bulk specimen along and transverse to the applied field. There is a strong anisotropy in the effect: σzz is proportional to (H - Hc2)−fraction three-twos but σxx is proportional to (H - Hc2)−½, where the z axis is along the magnetic field. The results are in agreement with a recent microscopic calculation by Usadel.
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