Collective Excitations in the Charge-Ordered Phase of alpha-(BEDT-TTF)2I3

Abstract

The charge response of charge-ordered state in the organic conductor alpha-(BEDT-TTF)2I3 is characterized by dc resistivity, dielectric and optical spectroscopy in different crystallographic directions within the two-dimensional conduction layer. Two dielectric modes are detected. The large mode is related to the phason-like excitation of the 2kF bond-charge density wave which forms in the ab plane. The small dielectric mode is associated with the motion of domain-wall pairs along the a- and b-axes between two types of domains which are created due to inversion symmetry breaking.

resubmitted to Phys. Rev. Lett.; 4 pages, 3 figures

References in corpus (3)

• Evidence for unusual superconducting correlations coexisting with stripe order in La(1.875)Ba(0.125)CuO(4)
• Charge Ordering in alpha-(BEDT-TTF)2I3 by synchrotron x-ray diffraction
• Collective Charge Excitations below the Metal-to-Insulator Transition in BaVS3

Cited by in corpus (21)

• Absence of charge order in the dimerized κ-phase BEDT-TTF salts
• Electrodynamic Response of the Charge Ordering Phase: Dielectric and Optical Studies of alpha-(BEDT-TTF)2I3
• Optical freezing of charge motion in an organic conductor
• Insulating nature of strongly correlated massless Dirac fermions in an organic crystal
• Collective excitation of electric dipole on molecular dimer in organic dimer-Mott insulator
• Molecular Quantum Materials: Electronic Phases and Charge Dynamics in Two-Dimensional Organic Solids
• Pressure-dependent optical investigations of $\alpha$-(BEDT-TTF)${}_2$I${}_3$: tuning charge order and narrow gap towards a Dirac semimetal
• From charge- and spin-ordering to superconductivity in the organic charge-transfer solids
• Evidence for electronically-driven ferroelectricity in the family of strongly correlated dimerized BEDT-TTF molecular conductors
• Dielectric Spectroscopy on Organic Charge-Transfer Salts
• Ferroelectric properties of charge-ordered alpha-(BEDT-TTF)2I3
• Origin of the glass-like dynamics in molecular metals $\kappa$-(BEDT-TTF)${}_{\text{2}}$X: implications from fluctuation spectroscopy and $\text{ab initio}$ calculations
• Metal-Insulator Transition in the Dimerized Organic Conductor $\kappa$-(BEDT-TTF)${}_2$Hg(SCN)${}_2$Br
• Cooperative dynamics in charge-ordered state of alpha-(BEDT-TTF)2I3
• Semimetallic and charge-ordered $\alpha$-(BEDT-TTF)${}_2$I${}_3$: on the role of disorder in dc transport and dielectric properties
• Spin excitations in the quasi-two-dimensional charge-ordered insulator $\alpha$-(BEDT-TTF)${}_2$I${}_3$ probed via ${}^{13}$C NMR
• Electrically-induced phase transition in $\alpha$-(BEDT-TTF)${}_2$I${}_3$: Indications for high-mobility hot charge carriers
• Theory of inplane magnetoresistance in two-dimensional massless Dirac fermion system
• Phonon-Spectrum Narrowing Induced by Ultrafast Charge Fluctuation in an Organic Dimer Mott Insulator
• Energy Exchange between Phononic and Electronic Subsystem Governing The Nonlinear Conduction in DCNQI${}_2$Cu
• Third-order Electrical Conductivity of the Charge-ordered Organic Salt $\alpha$-(BEDT-TTF)${}_2$I${}_3$