Paramagnetic Effect in Superconductors : Part I. Quasi-Paramagnetism and Resistance of Indium at the Superconducting Transition

概要

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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 I_0 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 Ho, beyond which we cannot observe the quasi-paramagnetism at that temperature, as in the case of tin i.e. I_0 = ξγd(T_c-T) and H_0 = ξ(T_c-T)-I_0/γd. Here I_0, ξ and T_0 are characteristic constants of the superconductor and have values 0.6amp., 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 H_0 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 = I_g + 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.
社団法人日本物理学会の論文
1958-07-05