Meissner effect in honeycomb arrays of multiwalled carbon nanotubes

被引：18

作者：

Murata, N. ^{[1
,4
]}

Haruyama, J. ^{[1
,4
]}

Ueda, Y. ^{[1
]}

Matsudaira, M. ^{[1
]}

Karino, H. ^{[1
]}

Yagi, Y. ^{[4
]}

Einarsson, E. ^{[2
]}

Chiashi, S. ^{[2
]}

Maruyama, S. ^{[2
]}

Sugai, T. ^{[3
,4
]}

Kishi, N. ^{[3
]}

Shinohara, H. ^{[3
,4
]}

机构：

[1] Aoyama Gakuin Univ, Kanagawa 2298558, Japan

[2] Univ Tokyo, Bunkyo Ku, Tokyo 1130033, Japan

[3] Nagoya Univ, Nagoya, Aichi 4648602, Japan

[4] JST CREST, Kawaguchi, Saitama 3320012, Japan

来源：

PHYSICAL REVIEW B | 2007年 / 76卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.76.245424

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report a gradual magnetization drop with an onset temperature (T(c)) of 18-23 K found in the honeycomb arrays of multiwalled CNTs (MWNTs) showing a slight resistance decrease due to superconductivity. Magnetic field dependence of the drop and temperature dependence of critical fields indicate that it is attributed to Meissner effect for type-II superconductors. The T(c) value is the highest among those in new carbon-related superconductors. The weak magnetic anisotropy, superconductive coherence length (11-19 nm), and disappearance of the Meissner effect after destructing array structure suggest that intertube coupling of MWNTs in the honeycomb array is a dominant factor for the mechanism. Drastic reduction of ferromagnetic catalyst for synthesis of the MWNTs makes the finding possible.

引用

页数：6

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