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RF-studies of vortex dynamics in isotropic type-II superconductors

机译:各向同性II型超导体中涡旋动力学的RF研究

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We have measured the surface impedance of thick superconductors in the mixed state over a broad 2 kHz-20 MHz frequency range. The depinning cross-over is observed, but it is much broader than expected from classical theories of pinning. A striking result is the existence of size effects which invalidate the common interpretation of the low-frequency surface inductance in terms of a single penetration depth. Instead, a two-mode description of vortex dynamics, assuming free vortex flow in the bulk and surface pinning, accounts quantitatively for the spectrum of the complex apparent penetration depth. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 26]
机译:我们已经测量了在2 kHz-20 MHz宽频率范围内处于混合状态的厚型超导体的表面阻抗。观察到了钉扎交叉,但是它比经典钉扎理论所预期的要广泛得多。一个惊人的结果是存在尺寸效应,该尺寸效应使就单个穿透深度而言的低频表面电感的一般解释无效。取而代之的是,假设在本体和表面钉扎中存在自由涡流,对涡旋动力学的两种模式描述定量地说明了复杂表观穿透深度的频谱。 (C)1998 Elsevier Science B.V.保留所有权利。 [参考:26]

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