Indirect exchange interaction in fully metal-semiconductor separated single-walled carbon nanotubes revealed by electron spin resonance

M. Havlicek, W. Jantsch, Z. Wilamowski, K. Yanagi, H. Kataura, M. H. Rümmeli, H. Malissa, A. Tyryshkin, Stephen Aplin Lyon, A. Chernov, H. Kuzmany

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Abstract

The ESR response from highly metal-semiconductor (M-SC) separated single-walled carbon nanotubes (SWCNTs) for temperatures T between 0.39 and 200 K is characteristically different for the two systems. The signal originates from defect spins but interaction with free electrons leads to a larger linewidth for M tubes. The latter decreases with increasing T, whereas it increases with T for SC tubes. The spins undergo a ferromagnetic phase transition below around 10 K. Indirect exchange is suggested to be responsible for the spin-spin interaction, supported by RKKY interaction in the case of M tubes. For SC tubes, the spin-lattice relaxation via an Orbach process is suggested to determine the linewidth.

Original languageEnglish (US)
Article number045402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number4
DOIs
StatePublished - Jul 5 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Havlicek, M., Jantsch, W., Wilamowski, Z., Yanagi, K., Kataura, H., Rümmeli, M. H., Malissa, H., Tyryshkin, A., Lyon, S. A., Chernov, A., & Kuzmany, H. (2012). Indirect exchange interaction in fully metal-semiconductor separated single-walled carbon nanotubes revealed by electron spin resonance. Physical Review B - Condensed Matter and Materials Physics, 86(4), [045402]. https://doi.org/10.1103/PhysRevB.86.045402