Low-Frequency Optical Properties of $β^{\prime\prime}$-(BEDO- TTF)$_5$[CsHg(SCN)$_4$]$_2$: Indications of Electronic Correlations in a 1/5-Filled Two-Dimensional Conductor

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dc.creatorDrichko, N.
dc.creatorPetukhov, K.
dc.creatorDressel, M.
dc.creatorBogdanova, O.
dc.creatorZhilyaeva, E.
dc.creatorLyubovskaya, R.
dc.creatorGreco, A.
dc.creatorMerino, J.
dc.date2003-09-17
dc.date.accessioned2026-07-07T02:53:30Z
dc.date.available2026-07-07T02:53:30Z
dc.descriptionThe polarized reflectivity of $β^{\prime\prime}$-(BEDO-TTF)$_5$[CsHg(SCN)$_4$]$_2$ is studied in the infrared range between 60 cm-1 and 6000 cm-1 from room temperature down to 10 K. Already at T=300 K a pseudogap in the optical conductivity is present of about 300 cm-1; the corresponding maximum in the spectrum shifts to lower frequencies as the temperature decreases. In contrast to quarter-filled BEDT-TTF-based conductors of the $β^{\prime\prime}$-phase a robust Drude component in the conductivity spectra is observed which we ascribe to the larger fraction of charge carriers associated with the 1/5-filling of the conduction band. This observation is corroborated by exact diagonalization calculations on an extended Hubbard model on a square lattice for different fillings. A broad band at 4000 cm-1 which appears for the electric field polarized parallel to the stacks of the BEDO-TTF molecules is associated to structural modulations in the stacks; these modulations lead to a rise of the dc and microwave resistivity in 100 to 30 K temperature range.
dc.description7pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0309398
dc.identifierhttp://arxiv.org/abs/cond-mat/0309398
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/22238
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleLow-Frequency Optical Properties of $β^{\prime\prime}$-(BEDO- TTF)$_5$[CsHg(SCN)$_4$]$_2$: Indications of Electronic Correlations in a 1/5-Filled Two-Dimensional Conductor
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