Bandwidth-controlled Mott transition in $\kappa -(BEDT-TTF{)}_{2}Cu[N(CN{)}_2]B{r}_{x}C{l}_{1-x}$ I. Optical studies of localized charge excitations

Abstract

Infrared reflection measurements of the half-filled two-dimensional organic conductors $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Br${}_x$Cl${}_{1-x}$ were performed as a function of temperature ($5\mathrm{K}<T<300$ K) and Br-substitution ($x=0$, 40%, 73%, 85%, and 90%) in order to study the metal-insulator transition. We can distinguish absorption processes due to itinerant and localized charge carriers. The broad mid-infrared absorption has two contributions: transitions between the two Hubbard bands and intradimer excitations from the charges localized on the (BEDT-TTF)${}_2$ dimer. Since the latter couple to intramolecular vibrations of BEDT-TTF, the analysis of both electronic and vibrational features provides a tool to disentangle these contributions and to follow their temperature and electronic-correlations dependence. Calculations based on the cluster model support our interpretation.

12 pages, 12 figures

References in corpus (12)

• Mott transition, antiferromagnetism, and unconventional superconductivity in layered organic superconductors
• Similarities between organic and cuprate superconductors
• Unconventional critical behaviour in a quasi-two-dimensional organic conductor
• Mott transition and transport crossovers in the organic compound $\kappa -(BEDT-TTF{)}_{2}Cu[N(CN{)}_2]Cl$
• Optical Conductivity in Mott-Hubbard Systems
• Transport properties of strongly correlated metals:a dynamical mean-field approach
• Transfer of Spectral Weight in Spectroscopies of Correlated Electron Systems
• Transport criticality of the first-order Mott transition in a quasi-two-dimensional organic conductor, $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]Cl
• Magnetic-Field-Induced Mott Transition in a Quasi-Two-Dimensional Organic Conductor
• Electronic correlation in the infrared optical properties of the quasi two dimensional $\kappa$-type BEDT-TTF dimer system
• Incoherent Interplane Conductivity of kappa-(BEDT-TTF)2Cu[N(CN)2]Br
• Phonon anomalies due to strong electronic correlations in layered organic metals

Cited by in corpus (41)

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• Bandwidth-controlled Mott transition in kappa-(BEDT-TTF)2Cu[N(CN)2]Br{x}Cl{1-x}: Optical studies of correlated carriers
• Quantum Spin Liquids Unveil the Genuine Mott State
• Quasiparticles at the verge of localization near the Mott metal-insulator transition in a two-dimensional material
• Molecular Quantum Materials: Electronic Phases and Charge Dynamics in Two-Dimensional Organic Solids
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• A phase diagram for light-induced superconductivity in $\kappa$-(ET)${}_2$-X
• Low-Temperature Dielectric Anomalies at the Mott Insulator-Metal Transition
• Metal-Insulator Transition in the Dimerized Organic Conductor $\kappa$-(BEDT-TTF)${}_2$Hg(SCN)${}_2$Br
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• Spin-current injection and detection in strongly correlated organic conductor
• Magneto-optical spectra of an organic antiferromagnet as a candidate for an altermagnet
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• Photoexcitation-Energy-Dependent Transition Pathways from a Dimer Mott Insulator to a Metal
• Superconducting-like response in driven systems near the Mott transition
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• Antiferromagnetic State in $\kappa$-type Molecular Conductors: Spin Splitting and Mott Gap
• Superconductivity and Mottness in Organic Charge Transfer Materials
• The metal-insulator transition in the organic conductor ${\beta }^{\prime \prime }$-(BEDT-TTF)${}_2$Hg(SCN)${}_2$Cl
• DC and high-frequency conductivity of the organic metals beta"-(BEDT-TTF)2SF5RSO3 (R = CH2CF2 and CHF)
• Spectroscopic signature of trimer Mott insulator and charge disproportionation in BaIrO${}_3$
• Electronic State and Optical Response in a Hydrogen-Bonded Molecular Conductor
• Interacting electron spins in $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]I investigated by ESR spectroscopy
• Charge localization in strongly correlated $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2$]I due to inherent disorder
• Possible observation of the signature of the bad metal phase and its crossover to a Fermi liquid in K(BEDT-TTF)2Cu(NCS)2 bulk and nanoparticles by Raman scattering
• Localized states in the Mott insulator κ-(BEDT-TTF)_2Cu[N(CN)_2]Cl as probed by photoluminescence
• Dimer-Mott and charge-ordered insulating states in the quasi-one-dimensional organic conductors ${\delta }_P^{\prime }$- and ${\delta }_C^{\prime }$-(BPDT-TTF)${}_2$ICl${}_2$
• Pseudogap with Fermi arcs and Fermi pockets in half-filled twisted transition metal dichalcogenides
• Electronic properties of the dimerized organic conductor $\kappa$-(BETS)${}_2$Mn[N(CN)${}_2$]${}_3$
• Symmetry breaking driven by petahertz electron acceleration in a centrosymmetric organic superconductor
• Superconducting fluctuations in organic molecular metals enhanced by Mott criticality