Non-Magnetic Localized State in Aluminum : I. Superconducting Transition Temperature

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概要

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• The change in T_c of the superconducting transition temperature of aluminum due to the addition of 3d transitional impurities Ti, V, Cr, Mn, Fe and Ni is measured as a function of the residual resistance ratio p in the region of dilute concentrations ranging from 0.001 to 0.04 atomic percent. The contribution due to the smearing out of the energy gap anisotropy (ΔT_c)_<anis> is estimated by assuming that it can be accounted for by the theory of Markowitz and Kadanoff. (ΔT_c)_<anis> thus estimated is found to depend only on the mean free path and very little on the type of impurity. The remaining part (Δγ_c)_v obtained by subtracting (ΔT_c)_<anis> from the observed change in the transition temperature, is found to be negative showing a dependence on impurity similar to that found for the residual resistance but differing that it shows a rather sharp minimum at Mn. Comparison with theories based on the Anderson model of localized states in metals are made. It is shown that the overall behavior shows fair agreement with theories which include the effect of the d-d coulomb correlation energy.

• 社団法人日本物理学会の論文
• 1967-11-05

著者

• Aoki Ryozo

  The Institute For Solid State Physics The University Of Tokyo

• Ohtsuka Taiichiro

  The Institute For Solid State Physics The University Of Tokyo

関連論文

• The Specific Heat and Superconductivity of La-Y Alloys
• Non-Magnetic Localized State in Aluminum : I. Superconducting Transition Temperature

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