Strong electronic correlations in Li${}_x$ZnPc organic metals

Abstract

Nuclear magnetic resonance, electron paramagnetic resonance and magnetization measurements show that bulk Li${}_x$ZnPc are strongly correlated one-dimensional metals. The temperature dependence of the nuclear spin-lattice relaxation rate $1/T_1$ and of the static uniform susceptibility ${\chi }_S$ on approaching room temperature are characteristic of a Fermi liquid. Moreover, while for $x\simeq 2$ the electrons are delocalized down to low temperature, for $x\to 4$ a tendency towards localization is noticed upon cooling, yielding an increase both in $1/T_1$ and ${\chi }_s$. The $x$-dependence of the effective density of states at the Fermi level $D(E_F)$ displays a sharp enhancement for $x\simeq 2$, at the half filling of the ZnPc lowest unoccupied molecular orbitals. This suggests that Li${}_x$ZnPc is on the edge of a metal-insulator transition where enhanced superconducting fluctuations could develop.

5 pages, 4 figures

References in corpus (6)

• Superconductivity in Fullerides
• Strongly Correlated Superconductivity
• Electronic transport through electron-doped Metal-Phthalocyanine Materials
• Strong Correlations in Electron Doped Phthalocyanine Conductors Near Half Filling
• Electronic structure and correlations in pristine and potassium doped Cu-Phthalocyanine molecular crystals
• Low-energy excitations in electron-doped metal phthalocyanine from NMR in Li${}_{0.5}$MnPc

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