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Indirect Exchange Interaction in Fully Metal-Semiconductor Separated SWCNTs Revealed by ESR

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arxiv 1206.4543 v1 pith:3TWU5DE4 submitted 2012-06-20 cond-mat.mtrl-sci

Indirect Exchange Interaction in Fully Metal-Semiconductor Separated SWCNTs Revealed by ESR

M. Havlicek , W. Jantsch , Z. Wilamowski , K. Yanagi , H. Kataura , M. H. Rummeli , H. Malissa , A. Tyryshkin
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S. Lyon A. Chernov H. Kuzmany
This is my paper
classification cond-mat.mtrl-sci
keywords interactiontubesexchangeindirectlinemetal-semiconductorseparatedspins
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The ESR response from highly metal-semiconductor(M-SC) separated 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 line width 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 spin-lattice relaxation via an Orbach process is suggested to determine the line width.

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