Superconductivity in W-containing diamond-like nanocomposite films
Superconductivity in W-containing diamond-like nanocomposite films
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DOI：
10.1016/j.diamond.2006.07.019
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发表时间：
2006-11-01
影响因子：
4.1
通讯作者：
Aoyama, Takashi
中科院分区：
文献类型：
--
作者：
Miki, Hiroyuki;Takeno, Takanori;Aoyama, Takashi
报道了含钨碳氧化物薄膜的超导电性。采用化学气相沉积和钨金属靶共溅射的方法在多晶硅氧化物上沉积了厚度为500 nm的薄膜。通过拉曼光谱、X射线衍射和透射电子显微镜研究了薄膜中碳原子的成键状态以及宏观和微观晶体结构。根据实验结果，我们确定该膜基本上具有非晶结构。在2-300 K温度范围内测量了电阻率随温度的变化关系。在3.8K观察到电阻超导转变。在1.8- 6.5K温度范围内测量了直流磁化强度。在低于3.75 K时观察到了由超导态产生的抗磁性，这与电阻超导转变是一致的。我们认为，具有不同超导转变温度的有限尺寸团簇协同作用产生了宏观超导现象。(c)2006 Elsevier B. V.保留所有权利。
Superconductivity in a tungsten-containing carbon-oxide film was reported. The film with 500 nm, thickness was deposited onto polycrystalline silicon oxides using chemical vapor deposition and the co-sputtering of a tungsten metal target. The bonding state of the carbon atoms and the macroscopic and microscopic crystal structure of the film were investigated by Raman spectroscopy, X-ray diffraction and transmission electron microscopy measurements. From the experimental results, we determined that this film essentially had an amorphous structure. The temperature dependence on resistivity was measured in the temperature range of 2-300 K. Resistive superconducting transition was observed at 3.8 K. The dc magnetizations were measured in the temperature range of 1.8-6.5 K. The diamagnetism resulting from a superconductive state was observed below 3.75 K, which is consistent with a resistive superconducting transition. It is thought that the finite sized clusters of the different superconductive transition temperatures cooperatively produce a macroscopic superconducting phenomenon. (c) 2006 Elsevier B.V. All rights reserved.