engleski

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

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.

charge order; strongly correlated electron systems; dielectric loss and relaxation; collective effects; quasi-2d

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