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首页> 外文期刊>Physical review >Peak effect in optimally doped p-type single-crystal Ba_(0.5)K_(0.5)Fe_2As_2 studied by ac magnetization measurements
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Peak effect in optimally doped p-type single-crystal Ba_(0.5)K_(0.5)Fe_2As_2 studied by ac magnetization measurements

机译：交流磁化法研究最佳掺杂p型单晶Ba_（0.5）K_（0.5）Fe_2As_2的峰效应

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摘要

We have used the ac magnetic susceptibility to investigate the vortex state in an optimally doped p-type Ba_(0.5)K_(0.5)Fe_2As_2 single crystal under various ac and dc fields. A peak effect is observed in the temperature dependence of the in-phase ac susceptibility, indicating an order-disorder transition on the vortex phase diagram. The peak effect displays an anomalous history effect compared with other type-II superconductors, which we ascribe to the strong pinning existing in the material. We observe the development of a small dissipation peak at the temperature T_(p2) slightly below the peak effect region. Similar to the peak effect boundary, T_(p2) delimits a region in the H-T phase diagram which is independent on the ac field amplitude. We argue that this small peak may arise from the softening of the vortex lattice, leading to a collective pinning of the whole vortex lattice. This effect assists and further enhances the peak effect occurring in the Ba_(0.5)K_(0.5)Fe_2As_2 superconductor.
机译：我们已经使用交流磁化率研究了在各种交流和直流场下最佳掺杂的p型Ba_（0.5）K_（0.5）Fe_2As_2单晶中的涡旋状态。在同相磁化率的温度依赖性中观察到峰值效应，表明旋涡相图上有序到无序的转变。与其他II型超导体相比，峰效应显示出异常的历史效应，这归因于材料中存在的牢固钉扎。我们观察到在温度T_（p2）处略低于峰值影响区域的情况下，出现了一个小的耗散峰。与峰值效应边界类似，T_（p2）界定H-T相图中的一个区域，该区域与交流场振幅无关。我们认为，这个小峰可能是由于涡流晶格的软化引起的，从而导致整个涡流晶格的共同钉扎。该效应辅助并进一步增强了Ba_（0.5）K_（0.5）Fe_2As_2超导体中出现的峰值效应。

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  • 来源
    《Physical review》 |2013年第14期|144505.1-144505.7|共7页
  • 作者

    J. Ge; J. Gutierrez; J. Li; J. Yuan; H.-B. Wang; K. Yamaura; E. Takayama-Muromachi; V. V. Moshchalkov;

  • 作者单位

    INPAC-Institute for Nanoscale Physics and Chemistry, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;

    INPAC-Institute for Nanoscale Physics and Chemistry, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;

    INPAC-Institute for Nanoscale Physics and Chemistry, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium,Superconducting Properties Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;

    Superconducting Properties Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;

    Superconducting Properties Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan,Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210093, China;

    Superconducting Properties Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan,Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan;

    Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan, International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;

    INPAC-Institute for Nanoscale Physics and Chemistry, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;

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  • 正文语种 eng
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  • 关键词

    order-disorder transformations; statistical mechanics of model systems; superconductivity phase diagrams; magnetic properties;

    机译：有序-无序转换;模型系统的统计力学;超导相图;磁性;

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