PROTON NMR STUDY OF THE ORGANIC METAL κ- (BETS)₂ Mn[N(CN)₂]₃
Vyaselev O.M., Kushch N.D., Yagubskii E.V.

Received: March 10, 2011

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Magnetic properties of the organic conductor κ-(BETS)₂ Mn[N(CN)₂]₃ above and below the temperature of the metal-insulator transition that occurs at K are studied by ¹H NMR. The proton spectrum is shown to be determined by the static dipolar fields from Mn²⁺ localized moments, while the ¹H spin-lattice relaxation is dominated by fluctuating fields from Mn²⁺ electrons. The NMR data, both static (the spectra) and dynamic (the spin-lattice relaxation), indicate the freezing of Mn²⁺ moments into a short-range or an incommensurate long-range antiferromagnetic order below T_MI.