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Visualizing the ac magnetic susceptibility of superconducting films via magneto-optical imaging

机译：通过磁光成像可视化超导膜的交流磁化率

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摘要

We have established a link between the global ac response and the local flux distribution of superconducting films by combining magnetic ac susceptibility, dc magnetization, and magneto-optical measurements. The investigated samples are three Nb films: a plain specimen, used as a reference sample, and other two films patterned with square arrays of antidots. At low temperatures and small ac amplitudes of the excitation field, the Meissner screening prevents penetration of flux into the sample. Above a certain ac drive threshold, flux avalanches are triggered during the first cycle of the ac excitation. The subsequent periodic removal, inversion, and rise of flux occurs essentially through the already-created dendrites, giving rise to an ac susceptibility signal weakly dependent on the applied field. The intradendrite flux oscillation is followed, at higher values of the excitation field, by a more drastic process consisting of creation of new dendrites and antidendrites. In this more invasive regime, the ac susceptibility shows a clear field dependence. At higher temperatures a smooth penetration occurs, and the flux profile is characteristic of a critical state. We have also shown that the regime dominated by vortex avalanches can be reliably identified by ac susceptibility measurements.
机译：通过结合磁交流磁化率，直流磁化强度和磁光测量，我们在全局交流响应和超导薄膜的局部通量分布之间建立了联系。研究的样品是三片Nb膜：一个普通样品（用作参考样品），另外两幅膜用解毒剂的正方形阵列构图。在低温和激发场的交流振幅较小的情况下，迈斯纳屏蔽可防止助焊剂渗透到样品中。高于某个交流驱动阈值时，在交流励磁的第一个周期内会触发磁通雪崩。随后的通量的周期性去除，反转和上升基本上通过已经产生的树枝状晶体发生，从而产生弱依赖于所施加场的交流磁化率信号。在较高的激发场值下，树枝状晶体内部的通量振荡之后将经历更为剧烈的过程，该过程包括生成新的树枝状晶体和抗树枝状晶体。在这种更具侵入性的方案中，交流磁化率显示出明显的场依赖性。在较高的温度下会发生平滑渗透，通量曲线是临界状态的特征。我们还表明，可以通过交流磁化率测量可靠地确定以涡流雪崩为主的状态。

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  • 来源
    《Physical review》 |2011年第21期|p.214529.1-214529.7|共7页
  • 作者

    M. Motta; F. Colauto; R. Zadorosny; T. H. Johansen; R. B. Dinner; M. G. Blamire; G. W. Ataklti; V. V. Moshchalkov; A. V. Silhanek; W. A. Ortiz;

  • 作者单位

    Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, SP, Brazil;

    Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, SP, Brazil;

    Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, SP, Brazil;

    Department of Physics, University of Oslo, POB 1048, Blindern, NO-0316 Oslo, Norway,Centre for Advanced Study, Norwegian Academy of Science and Letters, NO-0271 Oslo, Norway;

    Department of Materials Science, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK;

    Department of Materials Science, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, UK;

    INPAC - Institute for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism Group,Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;

    INPAC - Institute for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism Group,Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;

    INPAC - Institute for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism Group,Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium,Departement de Physique, Universite de Liege, B-4000 Sart Tilman, Belgium;

    Departamento de Fisica, Universidade Federal de Sao Carlos, 13565-905 Sao Carlos, SP, Brazil,Centre for Advanced Study, Norwegian Academy of Science and Letters, NO-0271 Oslo, Norway;

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  • 关键词

    mesoscopic and nanoscale systems; multilayers, superlattices, heterostructures; superconductivity phase diagrams; mixed states, critical fields, and surface sheaths;

    机译：介观和纳米系统;多层;超晶格;异质结构;超导相图;混合状态;临界场和表面鞘;

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