Low-energy excitations in electron-doped metal phthalocyanine from NMR in Li$_{0.5}$MnPc

Details Low-energy excitations in electron-doped metal phthalocyanine from NMR in Li$_{0.5}$MnPc Low-energy excitations in electron-doped metal phthalocyanine from NMR in Li$_{0.5}$MnPc

2006-07-26

arxiv.org/abs/cond-mat/0607678v1

Phys. Rev. B 75, 085107 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

7 two-columns pages, 11 figures

Scientific paper

$^7$Li and $^1$H NMR and magnetization measurements in \lpc (Pc$\equiv$C$_{32}$H$_{16}$N$_8$), recently proposed as a strongly correlated metal, are presented. Two different low-frequency dynamics are evidenced. The first one, probed by $^1$H nuclei gives rise to a slowly relaxing magnetization at low temperature and is associated with the freezing of MnPc $S=3/2$ spins. This dynamic is similar to the one observed in pristine $\beta$-MnPc and originates from Li depleted chain segments. The second one, evidenced by $^7$Li 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 disorder is briefly discussed.

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