Low-temperature anomaly of microwave absorption and ac susceptibility of single-wall carbon nanotubes: Bulk superconductivity and weak ferromagnetism

B. Corzilius, K.-P. Dinse, J. van Slageren, and K. Hata
Phys. Rev. B 75, 235416 – Published 12 June 2007

Abstract

The electromagnetic properties of a bulk sample of high quality single-wall carbon nanotubes with a mean diameter of 2.5nm were investigated by noninvasive methods. The observed sudden increase in the microwave absorptivity below 12K 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 20K points to the existence of a weak ferromagnetism probably of a different set of tubes in the heterogeneous sample. Above 20K, the microwave loss function apparently originates predominantly from a narrow-band-gap (7meV) one-dimensional conductor.

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  • Received 9 February 2007

DOI:https://doi.org/10.1103/PhysRevB.75.235416

©2007 American Physical Society

Authors & Affiliations

B. Corzilius and K.-P. Dinse*

  • Physikalische Chemie III, Technische Universität Darmstadt, Petersenstrasse 20, 64287 Darmstadt, Germany

J. van Slageren

  • 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

K. Hata

  • AIST, Tsukuba Central 5, Tsukuba 305-8565, Japan

  • *Electronic address: dinse@chemie.tu-darmstadt.de

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Vol. 75, Iss. 23 — 15 June 2007

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