Superconductivity in bundles of double-wall carbon nanotubes.

Superconductivity in bundles of double-wall carbon nanotubes.
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DOI:
10.1038/srep00625
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发表时间:
2012
期刊:
影响因子:
4.6
通讯作者:
Dresselhaus, Mildred S.
Dresselhaus, Mildred S.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Shi, Wu;Wang, Zhe;Zhang, Qiucen;Zheng, Yuan;Ieong, Chao;He, Mingquan;Lortz, Rolf;Cai, Yuan;Wang, Ning;Zhang, Ting;Zhang, Haijing;Tang, Zikang;Sheng, Ping;Muramatsu, Hiroyuki;Kim, Yoong Ahm;Endo, Morinobu;Araujo, Paulo T.;Dresselhaus, Mildred S.

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我们提出了电和热比热测量,显示在双壁碳纳米管(DWCNT)束超导。明确的证据,包括作为温度的函数的电阻下降,磁阻和微分电阻签名的超导,建议一个特定的样品低于6.8 K的本征超导转变。 额外的电数据不仅证实了超导性的存在,而且还表明了可以从DWCNT的直径和手性的多样性中产生的Tc分布。观察到一个广泛的超导异常的比热的散装DWCNT样品,产生的Tc分布,以及从电气数据获得的分布范围相关。由于DWCNTs的准一维性决定了电子态密度峰的存在,在这种材料系统中的超导性的确认打开了通过施加栅极电压来调谐Tc的令人兴奋的可能性。
We present electrical and thermal specific heat measurements that show superconductivity in double-wall carbon nanotube (DWCNT) bundles. Clear evidence, comprising a resistance drop as a function of temperature, magnetoresistance and differential resistance signature of the supercurrent, suggest an intrinsic superconducting transition below 6.8 K for one particular sample. Additional electrical data not only confirm the existence of superconductivity, but also indicate the Tc distribution that can arise from the diversity in the diameter and chirality of the DWCNTs. A broad superconducting anomaly is observed in the specific heat of a bulk DWCNT sample, which yields a Tc distribution that correlates well with the range of the distribution obtained from the electrical data. As quasi one dimensionality of the DWCNTs dictates the existence of electronic density of state peaks, confirmation of superconductivity in this material system opens the exciting possibility of tuning the Tc through the application of a gate voltage.
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