(Cu,C)Ba$_{2}$Ca$_{2}$Cu$_3$O$_{9\pm\delta}$薄膜在柔性Hastelloy带材上的生长
Growth of (Cu,C)Ba$_{2}$Ca$_{2}$Cu$_3$O$_{9\pmδ}$ thin films on flexible Hastelloy tapes
AI总结：
该研究在柔性Hastelloy带材上成功制备了(Cu,C)Ba$_{2}$Ca$_{2}$Cu$_3$O$_{9\pm\delta}$超导薄膜，起始转变温度达112 K，零电阻温度约96-98 K，各向异性较小，为液氮温区高功率应用提供了新候选材料。
摘要：
超导电缆或磁体的应用要求超导体被制成导线或带材。对于铜氧化物超导体而言，这是一个巨大的挑战，因为高各向异性、非常短的相干长度和强的热涨落等因素会引起强烈的磁通运动。一种方法是利用带有氧化物缓冲层的柔性金属带材来制备超导薄膜。迄今为止最成功的例子是REBa$_2$Cu$_3$O$_7$（REBCO，RE=稀土元素）薄膜的带材形式，即所谓的涂层导体。然而，REBCO体系的超导转变温度被限制在约90 K。在这里，我们报道了另一种新型无毒超导薄膜的成功制备，即(Cu,C)Ba$_{2}$Ca$_{2}$Cu$_3$O$_{9\pm\delta}$，生长在具有LaMnO$_3$和CeO$_2$作为顶层缓冲层的柔性金属带材上。超导转变起始温度分别为112 K和110 K，零电阻转变温度分别约为96 K和98 K。在不同方向磁场下的电阻率随温度变化显示出相对较小的各向异性。进一步优化薄膜将提高零电阻转变温度，从而也能改善其应用特性。我们的结果表明，(Cu,C)Ba$_{2}$Ca$_{2}$Cu$_3$O$_{9\pm\delta}$是液氮温度区域高功率应用的有前景的候选材料。
英文摘要：
The applications of superconducting cable or magnet require that the superconductors are made into wires or tapes. For cuprate superconductors, this is a big challenge because of the strong flux motion induced by high anisotropy, very short coherence length and strong thermal fluctuation, etc. One of the ways is to fabricate superconducting films on flexible metallic tapes with oxide buffer layers. The successful one so far is the REBa$_2$Cu$_3$O$_7$ (REBCO, RE=rare earth elements) films in tape form, as called the coated conductors. While the superconducting transition temperature of REBCO system is limited to about 90 K. Here we report the successful fabrication of another new non-toxic superconducting film, namely (Cu,C)Ba$_{2}$Ca$_{2}$Cu$_3$O$_{9\pmδ}$ on these flexible metallic tapes with LaMnO$_3$ and CeO$_2$ as the top layers. The onset superconducting transition occurs at 112 K and 110 K, and the zero-resistance transition temperatures are about 96 K and 98 K, respectively. The temperature dependent resistivity under magnetic fields in different directions reveal a relatively small anisotropy. Further optimization of the films will improve the zero resistance transition temperature, thus can also improve the characteristic properties for applications. Our results show that the (Cu,C)Ba$_{2}$Ca$_{2}$Cu$_3$O$_{9\pmδ}$ is a promising candidate material for the high power applications in liquid nitrogen temperature region.
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