Low-temperature anomaly of microwave absorption and ac susceptibility of single-wall carbon nanotubes : Bulk superconductivity and weak ferromagnetism
Low-temperature anomaly of microwave absorption and ac susceptibility of single-wall carbon nanotubes : Bulk superconductivity and weak ferromagnetism
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单壁碳纳米管的低温微波吸收异常和交流磁化率：体超导性和弱铁磁性
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
K. Hata
中科院分区：
文献类型：
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作者：
B. Corzilius;K. Dinse;J. Slageren;K. Hata
采用非侵入性方法研究了平均直径为2.5 nm的高质量单壁碳纳米管的电磁特性。在12k以下观察到的微波吸收率的突然增加被认为是一小部分样品超导相形成的指示。在20k处交流磁化率峰值的增加表明在非均质样品中可能存在一组不同的管的弱铁磁性。在20 K以上，微波损耗函数明显主要来自于窄带隙7 meV的一维导体。
The electromagnetic properties of a bulk sample of high quality single-wall carbon nanotubes with a mean diameter of 2.5 nm were investigated by noninvasive methods. The observed sudden increase in the microwave absorptivity below 12 K is taken as indicative of the formation of a superconducting phase of a small part of the sample. The increase in the ac susceptibility peaking at 20 K points to the existence of a weak ferromagnetism probably of a different set of tubes in the heterogeneous sample. Above 20 K, the microwave loss function apparently originates predominantly from a narrow-band-gap 7 meV one-dimensional conductor.