Observation of quantum periodicity in the transition temperature of a superconducting cylinder. [Tin]
Observation of quantum periodicity in the transition temperature of a superconducting cylinder. [Tin]
复制标题
DOI：
10.1007/978-1-4613-0411-1_4
复制
发表时间：
1962-07
影响因子：
5.1
通讯作者：
W. Little;R. Parks
中科院分区：
文献类型：
--
作者：
W. Little;R. Parks
Deaver和Fairbank [1]以及Doll和Nabäuer [2]已经通过实验证明，超导圆柱体中俘获的亚麻是单位c/2 e的整数倍。已经指出3 '4，这一结果是因为，如果电子以巴丁-库珀-施里弗（BCS）理论所描述的方式配对，超导态的自由能在这个通量单位中是周期性的。5正常态的自由能，另一方面，实际上与通量无关。因此，正常态和超导态的自由能相等时的转变温度Tc也必然是封闭磁通Φ的周期函数。用BCS模型计算了薄圆柱样品Tc的变化幅度，其中包括了可能的粒子对和净动量。
Deaver and Fairbank1and Doll and Nabäuer2have shown experimentally that the flax which is trapped in a superconducting cylinder is an integral multiple of the unithc/2e. It has been pointed out3’4that this result follows because the free energy of the superconducting state is periodic in this unit of the flux if the electrons are paired in the manner described by the Bardeen-Cooper-Schrieffer (BCS) theory.5The free energy of the normal state, on the other hand, is virtually independent of the flux. Consequently, the transition temperatureTc, which is the temperature at which the free energy of the normal and superconducting states are equal, must also be a periodic function of the enclosed flux Φ. The magnitude of the change inTcwas calculated for a thin cylindrical sample using the BCS model in which the possible pairing of particles with net momentum was included.