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The ESR response from highly metal-semiconductor(M-SC) separated SWCNTs fortemperatures T between 0.39 and 200 K is characteristically different for thetwo systems. The signal originates from defect spins but interaction with freeelectrons leads to a larger line width for M tubes. The latter decreases withincreasing T whereas it increases with T for SC tubes. The spins undergo aferromagnetic phase transition below around 10 K. Indirect exchange issuggested to be responsible for the spin-spin interaction, supported by RKKYinteraction in the case of M tubes. For SC tubes spin-lattice relaxation via anOrbach process is suggested to determine the line width.

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