Electron Drag and Flow Stress in Niobium and Lead at 4.2°K

It has been found that the flow stresses of superconducting niobium and lead at 4.2\ifmmode^\circ\else\textdegree\fi{}K increase in the transition between superconducting and normal states produced by an external magnetic field. The ratio of the increment to the flow stress in the superconducting state is 2.9% in lead and 0.6% in niobium. It is concluded that the conduction electrons in the normal metals are impeditive for the motion of dislocations.

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