Dielectric Spectroscopy on Organic Charge-Transfer Salts

Abstract

This Topical Review provides an overview of the dielectric properties of a variety of organic charge-transfer salts, based on both, data reported in literature and our own experimental results. Moreover, we discuss in detail the different processes that can contribute to the dielectric response of these materials. We concentrate on the family of the one-dimensional (TMTTF)2X systems and the two-dimensional BEDT-TTF-based charge-transfer salts, which in recent years have attracted considerable interest due to their often intriguing dielectric properties. We will mainly focus on the occurrence of electronic ferroelectricity in these systems, which also includes examples of multiferroicity.

34 pages, 24 figures

References in corpus (11)

• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Colossal dielectric constant up to GHz at room temperature
• Broadband dielectric spectroscopy on single-crystalline and ceramic CaCu3Ti4O12
• Absence of charge order in the dimerized κ-phase BEDT-TTF salts
• Anisotropic charge dynamics in the quantum spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$
• Power-law dependence of the optical conductivity observed in the quantum spin-liquid compound κ-(BEDT-TTF)2Cu2(CN)3
• Electron localization near Mott transition in organic superconductor $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2]$Br
• Ferroelectric properties of charge-ordered alpha-(BEDT-TTF)2I3
• Optical probe of carrier doping by X-ray irradiation in organic dimer Mott insulator $\kappa$-(BEDT-TTF)${}_2$Cu[N(CN)${}_2]$Cl
• Correlation-driven electronic multiferroicity in (TMTTF)${}_2$-$X$ organic crystals
• Critical dynamics and domain motion from permittivity of the electronic ferroelectric (TMTTF)2AsF6

Cited by in corpus (15)

• Molecular Quantum Materials: Electronic Phases and Charge Dynamics in Two-Dimensional Organic Solids
• Evidence for electronically-driven ferroelectricity in the family of strongly correlated dimerized BEDT-TTF molecular conductors
• Polar and magnetic order in GaV4Se8
• Quantum Paraelectricity in the Kitaev Quantum-Spin-Liquid Candidates H${}_3$LiIr${}_2$O${}_6$ and D${}_3$LiIr${}_2$O${}_6$
• Orbital-Order Driven Ferroelectricity and Dipolar Relaxation Dynamics in Multiferroic GaMo${}_4$S${}_8$
• Semimetallic and charge-ordered $\alpha$-(BEDT-TTF)${}_2$I${}_3$: on the role of disorder in dc transport and dielectric properties
• Ingredients for Generalized Models of $\kappa$-Phase Organic Charge-Transfer Salts: A Review
• Probing the Ionic Dielectric Constant Contribution in the Ferroelectric Phase of the Fabre-Salts
• Coherent heavy charge carriers in an organic conductor near the bandwidth-controlled Mott transition
• Intriguing relaxor ferroelectricity in a polar CT crystal at the neutral-ionic interface
• Relaxation dynamics in the one-dimensional organic charge-transfer salt δ-(EDT-TTF-CONMe${}_2$)${}_2$Br
• Charge glass in an extended dimer Hubbard model
• Optical, dielectric, and magnetoelectric properties of ferroelectric and antiferroelectric lacunar spinels
• Electronic properties of the dimerized organic conductor $\kappa$-(BETS)${}_2$Mn[N(CN)${}_2$]${}_3$
• Third-order Electrical Conductivity of the Charge-ordered Organic Salt $\alpha$-(BEDT-TTF)${}_2$I${}_3$