Superconductivity of Sn-In Alloys. : I. Magnetization and Electrical Resistance

概要

論文の詳細を見る
The magnetic transition of Sn-In alloys at temperatures near the critical temperature range became broad with the increase of temperature for alloys with more than about 1.6 at. % In (nominal), which showed magnetic hysteresis with trapped flux. These alloys did not have well-defined critical temperatures and the superconducting transition occurred in certain critical temperature ranges. These behaviours are thought to be due to the inhomogeneous distribution of impurities. In the most dilute alloy-Sn-0.38 at. % In (nominal)-specimen, the superconducting nucleation field H_<c3> exceeded the thermodynamical critical field H_c and supercooling occurred at lower temperatures. However, its supercooling field for the bulk H_s was nearly equal to H_<c3> near the critical temperature. This result is in agreement with the calculations by Feder and by Park. Energy gap obtained from the magnetization with Toxen's formula approached the BCS value, 3.5 kT_c as the impurity increased.
社団法人日本物理学会の論文
1968-12-05