High superconducting transition temperature is favorable for the applications of superconductors. Some cuprate superconductors have the transition temperatures above 100 K, such as the Hg- or Tl-based 1223 and 1234 phases, but many of them contain the toxic elements, like Hg and Tl. Meanwhile, the anisotropy of upper critical field or the effective mass of above mentioned Hg-, Tl-based systems, or the non-toxic Bi2Sr2Ca2Cu3O10 with Tc = 110 K is high, which makes the vortices easy to move and the irreversibility magnetic field is very low in the liquid nitrogen temperature region. Here we report the successful synthesis of the c-axis oriented (Cu,C)Ba2Ca2Cu3O9±δ superconducting thin film with the zero-resistance transition temperature reaching 99.7 K. The superconducting transitions are rather sharp as revealed by both resistivity and magnetization measurements. Temperature dependent resistivity has been measured under different magnetic fields, and the irreversibility lines have been achieved. The resistivity was also measured with the magnetic field rotated in the ac-plane, and the data can be nicely scaled by using the anisotropic Ginzburg-Landau model, yielding a temperature dependent anisotropy which varies from 17 at 110 K to 4 at 77 K. Additionally, the critical current density calculated from the magnetization-hysteresis-loops reaches about 6×105A/cm2 (zero field) at 77 K. Thus the film may be a good candidate for the applications of superconducting cables or high frequency superconducting filters in liquid nitrogen temperature region.

中文翻译：

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零电阻转变温度接近 100 K 的 [公式省略][公式省略][公式省略] 的超导薄膜


高超导转变温度有利于超导体的应用。一些铜酸盐超导体的转变温度高于 100 K，例如基于 Hg 或 Tl 的 1223 和 1234 相，但其中许多含有有毒元素，如 Hg 和 Tl。同时，上述 Hg-、Tl 基体系或无毒的 Bi2Sr2Ca2Cu3O10 的上临界场或有效质量的各向异性较高，这使得涡旋易于移动，在液氮温度区域不可逆磁场非常低。本文报道了成功合成 c 轴取向 （Cu，C）Ba2Ca2Cu3O9±δ 超导薄膜，零电阻转变温度达到 99.7 K。电阻率和磁化强度测量都揭示了超导跃迁相当尖锐。在不同的磁场下测量了与温度相关的电阻率，并实现了不可逆线。电阻率也是用在交流平面上旋转的磁场测量的，通过使用各向异性 Ginzburg-Landau 模型可以很好地缩放数据，从而产生一个与温度相关的各向异性，从 110 K 时的 17 到 77 K 时的 4。此外，从 77 K 磁滞回线计算的临界电流密度达到约 6×105A/cm2（零场）。因此，该薄膜可能是液氮温度区域超导电缆或高频超导过滤器应用的良好候选者。