Abstract
We examined the effect of the flux-trapped states of Sn60-Pb40 solders on the superconducting properties of a Sn wire. The temperature dependence of electrical resistivity at H = 0 Oe after zero-field cooling (ZFC) showed a sharp superconducting transition at T = 3.7 K. In contrast, field cooling (FC) resulted in a broadening of the transition. The difference between ZFC and FC data evidences the critical effect of trapped fluxes at solders on superconducting states. We propose that, in electrical measurements where magnetic fields of several hundred Oe are critical, field experience should be seriously considered when using solders.
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