Further Experiments with Liquid Helium. I. TheHall-effect, and the magnetic change in resistance at low temperatures. IX. The appearance of galvanic resistance in supra-conductors which are brought into a magnetic field, at a threshold value of the field

Abstract

In my last paper upon the properties of supra-conductors, and in the summary of my experiments in that direction which I wrote for the Third International Congress of Refrigeration in Chicago (Sept. 1913, Suppl. N°. 34b), I frequently referred to the possibility of resistance being generated in supra-conductors by the magnetic field. There were, however, reasons to suppose that its amount would be small. The question as to whether the threshold value of the current might be connected with the magnetic resistance by the field of the current itself becoming perceptible could be answered in the negative, as we had then no reason to think of a law of increase of the resistance with the field other than proportional to it, otto the square of it, and the law of increase of the potential differences at currents above the threshold value could not be reconciled with either supposition.