Injection of Cooper pairs into quasidiffusive multiwalled carbon nanotubes with weak localization
Injection of Cooper pairs into quasidiffusive multiwalled carbon nanotubes with weak localization
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将库珀对注入弱局域化准扩散多壁碳纳米管
DOI：
10.1103/physrevb.68.165420
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发表时间：
2003
影响因子：
3.7
通讯作者：
H. Takayanagi
中科院分区：
文献类型：
--
作者：
J. Haruyama;K. Takazawa;S. Miyadai;A. Takeda;N. Hori;I. Takesue;Y. Kanda;N. Sugiyama;T. Akazaki;H. Takayanagi
研究了库珀对注入到铌~Nb！/准扩散多壁碳纳米管~MWNT's！/铝！具有弱定位的连接。在氧化铝膜的纳米孔中站立的MWNT的开放顶端上的Nb电极的蒸发使得端键合结构成为可能，从而导致高度透明的Nb/MWNT界面。我们发现邻近诱导电导增加~PIC！，MWNT中的库珀对的极大扩散常数增强了这一点，起始温度高达T56 - 9 K。相反，我们澄清，这种PIC是非常敏感的MWNT/Al界面在低温下的透明度。高透明度导致重入电导由于扩散出的库珀对，而我们成功地发现超导在T50.6 K，这意味着增强的临界磁场，在一些低透明度的样品。
We study the influence of Cooper pair injection into niobium ~Nb!/quasidiffusive multiwalled carbon nanotube ~MWNT’s!/aluminum ~Al! junctions possessing weak localization. Evaporation of the Nb electrode on the open top end of MWNT’s standing in nanopores of alumina membranes makes end-bonded structures possible, leading to highly transparent Nb/MWNT interfaces. We found a proximity-induced conductance increase ~PIC!, which was enhanced by the extremely large diffusion constant of the Cooper pair in the MWNT’s, with onset temperatures as high as T56 ‐ 9 K. In contrast, we clarified that this PIC was very sensitive to the transparency of the MWNT/Al interface at low temperatures. High transparency led to reentrant conductance due to diffusion out of the Cooper pairs, while we successfully found superconductivity at T50.6 K, implying enhanced critical magnetic fields, in some of the low-transparency samples.