The Pinning Potential and High‐Frequency Studies of Type‐II Superconductors
The Pinning Potential and High‐Frequency Studies of Type‐II Superconductors
复制标题
II型超导体的钉扎势和高频研究
DOI：
10.1063/1.1656632
复制
发表时间：
1968
影响因子：
3.2
通讯作者：
B. Rosenblum
中科院分区：
文献类型：
--
作者：
J. Gittleman;B. Rosenblum
II型超导体的电阻抗随频率的函数用“钉住电位”进行了讨论。“在任何频率下，混合态的许多通量固定特性都可以用这样的势和Bardeen - Stephen通量流理论的简单现象学扩展来处理。电势的形式可以通过各种直流和高频实验来确定。有一个临界频率，在这个频率以上，亚临界电流的阻抗就变成了“理想”混合状态的阻抗。远低于这个频率，阻抗为零。该临界频率由ω0=2πCρnα/φ01/2Hc2H1/2给出。在微波频率下，几乎所有的磁通钉住效应都不存在，即使在最强钉住的材料中也能观察到“理想”混合态的性质。这种测量已被用来确定磁通管的有效质量。
The electrical impedance of type‐II superconductors as a function of frequency is discussed in terms of a ``pinning potential.'' Many flux‐pinning properties of the mixed state at any frequency can be treated in terms of such a potential and a simple phenomenological extension of the Bardeen‐Stephen flux‐flow theory. The form of the potential can be determined by various dc and high‐frequency experiments. There is a critical frequency above which the impedance for subcritical currents becomes the impedance of the ``ideal'' mixed state. Much below this frequency the impedance is zero. This critical frequency is given by ω0=2πCρnα/φ01/2Hc2H1/2. At microwave frequencies, almost all effects of flux pinning are absent, and the properties of the ``ideal'' mixed state are observed even in the most strongly pinned material. Such measurements have been used to determine the effective mass of the flux tube.