抄録
As a continuation of the previous investigation on the paramagnetic effect in tin we have investigated the same effect in indium. The minimum of current I0 necessary for the occurrence of the paramagnetic effect has been represented by the same functions of the temperature T and the maximum of external magnetic field H0, beyond which we cannot observe the quasi-paramagnetism at that temperature, as in the case of tin i.e. I0=ξγd(Tc−T) and H0=ξ(Tc−T)−Ig⁄γd. Here Ig, ξ and Tc are characteristic constants of the superconductor and have values 0.6 amp., 94.4 oersted/deg. and 3.422°K respectively for the case of indium: γ is 0.27 amp./mm. oe. The maximum of external magnetic field H0 and the specimen diameter d are measured in oersted and in mm. respectively. These formulas are understood in a good approximation as those for the intersection of the plane I=Ig+γdH with the transition surface in the (I–H–T) space. In parallel with the measurement of the magnetic flux, plotted as a function of the current at constant temperature and external magnetic field, a measurement of the resistance of the same specimen has been performed. The results obtained are in good accordance with an expression derived in a modified form from the theory proposed by H. Meissner.
