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The infrared spectra of the quasi-two-dimensional organic conductors$\alpha$-(BEDT-TTF)$_2$$M$Hg(SCN)$_4$ ($M$ = NH$_4$, Rb, Tl) were measured inthe range from 50 to 7000 \cm down to low temperatures in order to explore theinfluence of electronic correlations in quarter-filled metals. Theinterpretation of electronic spectra was confirmed by measurements of pressuredependant reflectance of $\alpha$-(BEDT-TTF)$_2$KHg(SCN)$_4$ at T=300 K. Thesignatures of charge order fluctuations become more pronounced when going fromthe NH$_4$ salt to Rb and further to Tl compounds. On reducing the temperature,the metallic character of the optical response in the NH$_4$ and Rb saltsincreases, and the effective mass diminishes. For the Tl compound, clearsignatures of charge order are found albeit the metallic properties stilldominate. From the temperature dependence of the electronic scattering rate thecrossover temperature is estimated below which the coherent charge-carriersresponse sets in. The observations are in excellent agreement with recenttheoretical predictions for a quarter-filled metallic system close to chargeorder

physical review. b, condensed matter and materials physics

Electronic properties of correlated metals in the vicinity of a charge-order transition: Optical spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>α</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>BEDT</mml:mi><mml:mtext>−</mml:mtext><mml:mi>TTF</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:mi>M</mml:mi><mml:mi mathvariant="normal">Hg</mml:mi><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml…

Electronic properties of correlated metals in the vicinity of a charge-order transition: Optical spectroscopy ofα−(BEDT−TTF)2MHg(