Thermal Conductivity in a Pure Type II Superconductor near the Upper Critical Field
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The thermal conductivity, K, of a pure Nb (RRR=1900) has been studied as a function of longitudinal and transverse magnetic field between 1.8°K and the transition temperature (9.2°K). The thermal conductivity shows a deep minimum just above H_<c1> and increases with infinite slope in the gapless region near H_<c2> like 〓K/K_<n>=C(H_<c2>-H)^<1/2> in good agreement with the Maki theory for both longitudinal and transverse field configurations. The temperature dependence of the coefficient C is compared with numerically calculated one from the revised Maki theory which includes both the impurity scattering and the phonon scattering, and a fairly good agreement is found between them, when the density of states is assumed to be 1.6×10^<33> states/cm^3 erg.
- 東北大学の論文
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