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首页> 外文期刊>Physica, B. Condensed Matter >Flux dynamics and critical state in YBCO by AC harmonic susceptibility
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Flux dynamics and critical state in YBCO by AC harmonic susceptibility

机译：交流谐波磁化率在YBCO中的通量动力学和临界状态

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The temperature dependences of the third harmonics of the AC susceptibility, chi'(3)(T) and chi "(3)(T), have been used to study the vortex dynamics in Melt Textured YBCO. The experimental curves measured at different AC field amplitudes and frequencies, have been compared with the simulations of chi'(3)(T) and chi "(3)(T) obtained by considering the diffusion of the magnetic flux in the presence of different dynamic regimes. The comparison made as function of the AC field frequency shows that, at low frequencies, the magnetic response is mainly described in terms of a Bean critical state model, As the frequency is increased, the contributions coming from the flux dynamic regimes become predominant. Nevertheless, at the highest frequencies, contrary to what was expected, the curves appear again very similar to the ones simulated in terms of a pure Bean critical state model. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 5]
机译：交流磁化率三次谐波chi'（3）（T）和chi“（3）（T）的温度依赖性已被用于研究熔融织构YBCO中的涡旋动力学。在不同交流电下测得的实验曲线场振幅和频率已经与chi'（3）（T）和chi“（3）（T）的模拟进行了比较，该模拟通过考虑在不同动态范围下的磁通量扩散而获得。根据交流磁场频率进行的比较表明，在低频时，磁响应主要根据Bean临界状态模型来描述。随着频率的增加，来自磁通动态范围的贡献将占主导地位。但是，在最高频率下，与预期相反，曲线再次看起来非常类似于纯Bean临界状态模型所模拟的曲线。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：5]

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