The high-frequency resistance of superconducting tin
The high-frequency resistance of superconducting tin
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DOI：
10.1098/rspa.1940.0105
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发表时间：
1940-11
期刊：
影响因子：
--
通讯作者：
H. London
中科院分区：
文献类型：
--
作者：
H. London
在20.5cm的波长下测量超导状态下的锡的高频电阻。采用基于涡流加热原理的量热法。发现当温度低于转变点时，电阻逐渐减小，这与直流特有的电阻突然下降相反。对这种行为的解释是基于正常电子和超导电子同时存在的假设。理论与实验之间发现了良好的一致性。对低温常态下高、低频电导率进行了绝对测量，发现在液氦温度下，高频电导率明显低于低频电导率。这种行为可能是由于在高电导率和高频条件下，由于趋肤效应，电子的平均自由程变得大于穿透深度。
The high-frequency resistance of tin in the superconducting state was measured at a wave-length of 20.5 cm. by a calorimetric method based on the principle of eddy-current heating. It was found that the resistance decreases gradually when the temperature falls below the transition point in contrast to the sudden drop in resistance peculiar to direct currents. An explanation of such a behaviour is given based on the assumption of the simultaneous presence of normal and superconducting electrons. Good agreement between theory and experiment was found. Absolute measurements of the conductivity in the normal state at low temperatures with both high and low frequencies were carried out, and it was found that at the temperature of liquid helium the conductivity for high frequency is considerably lower than for low frequency. This behaviour is possibly due to the fact that the mean free path of the electrons becomes larger than the penetration depth due to skin effect under the conditions of high conductivity and high frequency.