Low-energy excitations in the electron-doped metal phtalocyanine LiO.5MnPc from Li and 1H NMR

Filibian, Marta; Carretta, Pietro; Tmiyake, T.Miyake; Ytaguchi, Y.Taguchi; Yiwasa, Y.Iwasa

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NMR and magnetization measurements in Li0.5MnPc (Pc=C32H16N8), recently proposed as a strongly correlated metal, are presented. Two different low-frequency dynamics are evidenced. The first one, probed by 1H nuclei, gives rise to a slowly relaxing magnetization at low temperature and is associated with the freezing of MnPc S=3/2 spins. This dynamics is similar to the one observed in pristine beta-MnPc and originates from Li-depleted chain segments. The second one, evidenced by the 7Li spin-lattice relaxation rate, is associated with the hopping of the electrons along Li-rich chains. The characteristic correlation times for the two dynamics are derived, and the role of the disorder is briefly discussed.

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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11571/32594

Titolo:	Low-energy excitations in the electron-doped metal phtalocyanine LiO.5MnPc from Li and 1H NMR
Autori interni:	FILIBIAN, MARTA CARRETTA, PIETRO
Data di pubblicazione:	2007
Rivista:	PHYSICAL REVIEW B, SOLID STATE
Abstract:	NMR and magnetization measurements in Li0.5MnPc (Pc=C32H16N8), recently proposed as a strongly correlated metal, are presented. Two different low-frequency dynamics are evidenced. The first one, probed by 1H nuclei, gives rise to a slowly relaxing magnetization at low temperature and is associated with the freezing of MnPc S=3/2 spins. This dynamics is similar to the one observed in pristine beta-MnPc and originates from Li-depleted chain segments. The second one, evidenced by the 7Li spin-lattice relaxation rate, is associated with the hopping of the electrons along Li-rich chains. The characteristic correlation times for the two dynamics are derived, and the role of the disorder is briefly discussed.
Handle:	http://hdl.handle.net/11571/32594
Appare nelle tipologie:	1.1 Articolo in rivista

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