NMR evidence for gapped spin excitations in metallic carbon nanotubes

P. M. Singer, P. Wzietek, H. Alloul, F. Simon, H. Kuzmany

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

We report on the spin dynamics of C13 isotope enriched inner walls in double-wall carbon nanotubes using C13 nuclear magnetic resonance. Contrary to expectations, we find that our data set implies that the spin-lattice relaxation time (T1) has the same temperature (T) and magnetic field (H) dependence for most of the inner-wall nanotubes detected by NMR. In the high-temperature regime (T 150K), we find that the T and H dependence of 1/T1T is consistent with a 1D metallic chain. For T 150K we find a significant increase in 1/T1T with decreasing T, followed by a sharp drop below 20K. The data clearly indicate the formation of a gap in the spin excitation spectrum, where the gap value 2Δ 40K (3.7meV) is H independent.

Original languageEnglish
Article number236403
JournalPhysical review letters
Volume95
Issue number23
DOIs
Publication statusPublished - Dec 2 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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