NMR Evidence for Gapped Spin Excitations in Metallic Carbon Nanotubes

Details NMR Evidence for Gapped Spin Excitations in Metallic Carbon Nanotubes NMR Evidence for Gapped Spin Excitations in Metallic Carbon Nanotubes

2005-10-07

arxiv.org/abs/cond-mat/0510195v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures. Submitted to PRL on 12 August 2005

Scientific paper

10.1103/PhysRevLett.95.236403

We report on the spin dynamics of 13C isotope enriched inner-walls in double-wall carbon nanotubes (DWCNT) using 13C nuclear magnetic resonance (NMR). 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 innerwall nanotubes detected by NMR. In the high temperature regime (T > 150 K), we find that the T and H dependence of 1/T1T is consistent with a 1D metallic chain. For T < 150 K, we find a significant increase in 1/T1T with decreasing T, followed by a sharp drop below 20 K. The data clearly indicates the formation of a gap in the spin excitation spectrum, where the gap value 2 Delta = 40 K (= 3.7 meV) is H independent.

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