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首页> 外文期刊>Physical review >Intrinsic pinning and the critical current scaling of clean epitaxial Fe(Se,Te) thin films
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Intrinsic pinning and the critical current scaling of clean epitaxial Fe(Se,Te) thin films

机译：清洁外延Fe（Se，Te）薄膜的内在钉扎和临界电流缩放

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摘要

We report on the transport properties of clean, epitaxial Fe(Se,Te) thin films prepared on Fe-buffered MgO (001) single crystalline substrates by pulsed laser deposition. Near T_C a steep slope of the upper critical field for Hab was observed (74.1 T/K), leading to a very short out-of-plane coherence length, ξ_C(0), of 0.2 nm, yielding 2ξ_C(0) ≈ 0.4 nm. This value is shorter than the interlayer distance (0.605 nm) between the Fe-Se(Te) planes, indicative of modulation of the superconducting order parameter along the c axis. An inverse correlation between the power law exponent N of the electric field-current density(E-J) curve and the critical current density J_C has been observed at 4 K, when the orientation of H was close to the ab plane. These results prove the presence of intrinsic pinning in Fe(Se,Te). A successful scaling of the angular dependent J_C and the corresponding exponent N can be realized by the anisotropic Ginzburg Landau approach with appropriate F values 2 ~ 3.5. The temperature dependence of Γ behaves almost identically to that of the penetration depth anisotropy.
机译：我们报告通过脉冲激光沉积在Fe缓冲MgO（001）单晶衬底上制备的清洁，外延Fe（Se，Te）薄膜的传输性能。在T_C附近观察到Hab的上临界场的陡峭斜率（74.1 T / K），导致面外相干长度ξ_C（0）非常短，为0.2 nm，产生2ξ_C（0）≈0.4纳米该值比Fe-Se（Te）平面之间的层间距离（0.605 nm）短，表明沿c轴调制了超导参数。当H的方向接近ab平面时，在4 K处观察到电场-电流密度（E-J）曲线的幂律指数N与临界电流密度J_C成反比关系。这些结果证明了Fe（Se，Te）中固有钉扎的存在。可以通过各向异性的Ginzburg Landau方法在适当的F值为2〜3.5的情况下成功实现与角度相关的J_C和相应的指数N的成功缩放。 Γ的温度依赖性与渗透深度各向异性几乎相同。

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  • 来源
    《Physical review》 |2013年第10期|104510.1-104510.6|共6页
  • 作者

    Kazumasa lida; Jens Hanisch; Elke Reich; Fritz Kurth; Ruben Hiihne; Ludwig Schultz; Bernhard Holzapfel; Ataru Ichinose; Masafumi Hanawa; Ichiro Tsukada; Michael Schulze; Saicharan Aswartham; Sabine Wurmehl; Bernd Biichner;

  • 作者单位

    Institute for Metallic Materials, IFW Dresden, D-01171 Dresden, Germany;

    Institute for Metallic Materials, IFW Dresden, D-01171 Dresden, Germany;

    Institute for Metallic Materials, IFW Dresden, D-01171 Dresden, Germany;

    Institute for Metallic Materials, IFW Dresden, D-01171 Dresden, Germany;

    Institute for Metallic Materials, IFW Dresden, D-01171 Dresden, Germany;

    Institute for Metallic Materials, IFW Dresden, D-01171 Dresden, Germany;

    Institute for Metallic Materials, IFW Dresden, D-01171 Dresden, Germany;

    Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan;

    Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan;

    Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan;

    Institute for Solid State Research, IFW Dresden, D-01171 Dresden, Germany;

    Institute for Solid State Research, IFW Dresden, D-01171 Dresden, Germany;

    Institute fur Festkoperphysik Technische Universitdt Dresden, D-01062 Dresden, Germany and Institute for Solid State Research, IFW Dresden, D-01171 Dresden, Germany;

    Institute fur Festkoperphysik Technische Universitdt Dresden, D-01062 Dresden, Germany and Institute for Solid State Research, IFW Dresden, D-01171 Dresden, Germany;

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  • 正文语种 eng
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  • 关键词

    laser deposition; superconducting films and low-dimensional structures; critical currents;

    机译：激光沉积超导膜和低维结构;临界电流;

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