Magnetic Flux Increase and Resistance of Circular Indium Rods at the Superconducting Transition
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The so-called paramagnetic effect in superconductors has been investigated in indium. The current minimum I_0 required for the occurrence of the magnetic flux increase has been represented by the same functions of the temperature T and the external magnetic field maximum H_0, 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_g/γd. Here I_g, ξ and T_c are characteristic constants of the superconductor and have values 0.6 amp, 94.4 Oe/deg and 3.422°K respectively for the case of indium : γ is 0.27 amp/mm Oe. The external magnetic field maximum H_0 and the specimen diameter d are measured in Oe and in mm respectively. It has been shown also that 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, and that the resultant magnetic field H_t (the external magnetic field H plus the magnetic field H_1 due to the current) at the specimen surface for the maximum of quasi-paramagnetism at constant magnetic field and temperature is, however, less than H_c. 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 result of the resistance measurement is in good accordance with an expression derived in a modified form from the theory proposed by H. Meissner. The results obtained in the present investigation are not in a complete agreement with H. Meissner's theory. A possible explanation for this discrepancy is briefly touched.
- 東北大学の論文
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