Reorientational motion of cobaltocene intercalated into titanium diselenide: NMR study
Soloninin A. V.1, Skripov A. V.1, Titov A. N.1
1M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Email: alex.soloninin@imp.uran.ru
To study the dynamics of cobaltocene molecules Co(π-C_5H_5)2 intercalated into quasi-two-dimensional titanium diselenide TiSe2, we have measured the proton spin-lattice relaxation times and 1H nuclear magnetic resonance (NMR) spectra in TiSe_2l(Co(π-C_5H_5)_2r)1/4 compound over the temperature range of 5-360 K. The existence of two types of reorientational motion of Co(π-(C5H_5)2) molecules has been found. The faster reorientational process related to rotations of C5H5 rings around the 5-fold symmetry axis is characterized by the activation energy of 60 meV, and the slower process determined by reorientations of cobaltocene molecules around the 2-fold symmetry axis is characterized by the activation energy of 155 meV. Measurements of 1H NMR parameters in molecular cobaltocene have shown that for this compound the dominant mechanism of the proton spin-lattice relaxation is determined not by motion of Col(π-(C_5H_5)_2r) molecules, but by fluctuations of the localized electronic magnetic moment on cobalt. Keywords: metallocenes, transition-metal dichalcogenides, intercalation, spin-lattice relaxation, reorientations.
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