Conduction anisotropy and hall effect in the organic conductor (TMTTF)2AsF6 : Evidence for luttinger liquid behavior and charge ordering

We present the high-temperature $(70\phantom{\rule{0.3em}{0ex}}\mathrm{K}lTl300\phantom{\rule{0.3em}{0ex}}\mathrm{K})$ resistivity anisotropy and Hall effect measurements of the quasi-one-dimensional (1D) organic conductor $(\mathrm{TMTTF}{)}_{2}{\mathrm{AsF}}_{6}$. The temperature variations of the resistivity are pronouncedly different for the three different directions, with metalliclike at high temperatures for the $\mathbf{a}$ axis only. Above $220\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ the Hall coefficient ${R}_{H}$ is constant, positive, and strongly enhanced over the expected value; and the corresponding carrier concentration is almost 100 times lower than calculated for one hole/unit cell. Our results give evidence for the existence of a high-temperature regime above $200\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ where the 1D Luttinger liquid features appear in the transport properties. Our measurements also give strong evidence of charge ordering in $(\mathrm{TMTTF}{)}_{2}{\mathrm{AsF}}_{6}$. At the charge-ordering transition ${T}_{\mathrm{CO}}\ensuremath{\approx}100\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, ${R}_{H}(T)$ abruptly changes its behavior, switches sign, and rapidly increases with further temperature decrease.

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