Type I to Type II Transition in Superconducting In-3.9 at.%Pb Alloy
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The magnetization and the thermal conductivity of In-3.9 at.% Pb alloy are measured between 1°K and 4.2°K. It is found that this alloy sample does show type I to type II transition of the superconductivity at T_<cr>=2.2°K. Below T_<cr>, the magnetization decreases with finite slope near the upper critical field, H_<c2>, and the thermal conductivity shows deep minima both in the magnetic field dependence and in the temperature dependence. Above T_<cr>, on the other hand, the sample does not show any such effects mentioned above. The data concerning the residual resistivity ρ_n=2.46μΩcm, the transition temperature T_c=3.64°K, the mean free path l=5.69×10^<-6>cm, the G-L parameters K_1(0) =0.77 (at 0°K), k_1(1)=0.68 (at T_c) and the ratio k_1(0)/K_1(1)=1.13 are obtained. These values are all in good agreement with the results of previous investigations on In-Pb alloys.
- 東北大学の論文
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