1. Low-energy spin dynamics in the [YPc2]0 S = ½ antiferromagnetic chain.
- Author
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Branzoli, F., Carretta, P., Filibian, M., Klyatskaya, S., and Ruben, M.
- Subjects
- *
SPIN waves , *NUCLEAR spin , *FERROMAGNETISM , *ANTIFERROMAGNETISM , *MAGNETIC resonance , *ELECTRON paramagnetic resonance - Abstract
1H nuclear magnetic resonance (NMR) measurements in [YPc2]0, an organic compound formed by radicals stacking along chains, are presented. The temperature dependence of the macroscopic susceptibility of the NMR shift and of the spin-lattice relaxation rate 1/T1 indicate that the unpaired electron spins are not delocalized but rather form a S=1/2 antiferromagnetic chain. The exchange couplings estimated from those measurements are all in quantitative agreement. The low-energy spin dynamics can be described in terms of diffusive processes and the temperature dependence of the corresponding diffusion constant suggests that a spin gap at ~1 K might be present in this compound. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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